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Molecular Weight of Tamoxifen (C26H29NO)

Identification of Tamoxifen Chemical Compound

2D chemical structure image of tamoxifen
Chemical Formula C26H29NO
Molecular Weight 371.51456 g/mol
IUPAC Name (2-{4-[(1Z)-1,2-diphenylbut-1-en-1-yl]phenoxy}ethyl)dimethylamine
SMILES String CCC(=C(c1ccccc1)c2ccc(OCCN(C)C)cc2)c3ccccc3
InChI InChI=1S/C26H29NO/c1-4-25(21-11-7-5-8-12-21)26(22-13-9-6-10-14-22)23-15-17-24(18-16-23)28-20-19-27(2)3/h5-18H,4,19-20H2,1-3H3/b26-25-
InChIKey NKANXQFJJICGDU-QPLCGJKRSA-N

Molecular Weight Description

The tamoxifen molecule consists of 29 Hydrogen atom(s), 26 Carbon atom(s), 1 Nitrogen atom(s), and 1 Oxygen atom(s) - a total of 57 atom(s). The molecular weight of tamoxifen is determined by the sum of the atomic weights of each constituent element multiplied by the number of atoms, which is calculated to be:

$$ 371.51456 · \frac{g}{mol} $$

The exact term of the above molecular weight is “molar mass”, which is based on the atomic mass of each element. Molecular weight is actually an older term of “relative molar mass” or “molecular mass”, which is a dimensionless quantity equal to the molar mass divided by the molar mass constant defined by 1 g/mol.

Molecular masses are calculated from the standard atomic weights of each nuclide, while molar masses are calculated from the atomic mass of each element. The atomic mass takes into account the isotopic distribution of the element in a given sample.

3D chemical structure image of tamoxifen
Ball-and-stick model of tamoxifen

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Additional Information for Identifying Tamoxifen Molecule


  • InChI (IUPAC International Chemical Identifier) information of tamoxifen

    In addition to the molecular weight information, the structural information of tamoxifen in a textual expression is available via InChi. The full standard InChI of tamoxifen is given below:

    InChI=1S/C26H29NO/c1-4-25(21-11-7-5-8-12-21)26(22-13-9-6-10-14-22)23-15-17-24(18-16-23)28-20-19-27(2)3/h5-18H,4,19-20H2,1-3H3/b26-25-

    It can provide a way to encode the molecular information of tamoxifen to facilitate the search for the compound information in databases and on the web.

    The condensed, 27 character standard InChIKey (hashed version of the full standard InChI) of tamoxifen is:

    InChIKey=NKANXQFJJICGDU-QPLCGJKRSA-N

    It may allow easier web searches for tamoxifen. The InChIKey, however, needs to be linked to the full InChI as well in order to get back to the original structure of the tamoxifen as the full standard InChI cannot be reconstructed from the InChIKey.

  • Other names (synonyms) or registry numbers of tamoxifen

    There may be different names of the tamoxifen compound depending on the various situations of industrial applications, which are given below including the registry numbers if available:

    • Soltamoxreg
    • Nolvadexreg
    • (Z)-1-(p-Dimethylaminoethoxyphenyl)-1,2-diphenyl-1-butene, trans-2-[4-(1,2-Diphenyl-1-butenyl)phenoxy]-N,N-dimethylethylamine
    • 2-[4-[(Z)-1,2-di(phenyl)but-1-enyl]phenoxy]-N,N-dimethylethanamine
    • (Z)-2-(4-(1,2-diphenylbut-1-en-1-yl)phenoxy)-N,N-dimethylethanamine
    • 2-[4-[1,2-di(phenyl)but-1-enyl]phenoxy]-n,n-dimethylethanamine
    • (Z)-2-(para-(1,2-Diphenyl-1-butenyl)phenoxy)-N,N-dimethylamine
    • 1-[4-(2-Dimethylaminoethoxy)phenyl]-1,2-diphenyl-1-butene
    • Tamoxifen, certified reference material, TraceCERT(R)
    • A801229
    • AB00053547-18
    • AB00053547-17
    • AB00053547-16
    • B5965
    • SBI-0051170.P004
    • CCG-205277
    • 094ZI81Y45
    • HY-13757A
    • 2060AH
    • HMS3403J11
    • HMS3261D09
    • HMS2232C12
    • BDBM20607
    • Tamoxifen Drug Standard Solution
    • Ethanamine, 2-[4-[(1Z)-1,2-diphenyl-1-buten-1-yl]phenoxy]-N,N-dimethyl-
    • GTPL5384
    • GTPL1016
    • Tamoxifen, analytical standard
    • Tamone - (20 Mg)
    • Tamone - (10 Mg)
    • (Z)-2-[4-(1,2)-DIPHENYL-1-BUTENYL)-PHENOXY]-N,N-DIMETHYLETHANAMINE
    • Tamoxifen, >=99%
    • Penta-tamoxifen Tablets
    • Nolvadex-D Tab 20mg
    • nchembio.140-comp7
    • Apo-tamox Tab 20mg
    • Apo-tamox Tab 10mg
    • nchembio732-comp3
    • nchembio.76-comp1
    • Tamoplex Tab 20mg
    • Tamoplex Tab 10mg
    • Nolvadex Tab 10mg
    • Tamoxifene - 20
    • Tamoxifene - 10
    • Tamofen 20
    • Tamofen 10
    • Tamone Tab 20mg
    • Tamone Tab 10mg
    • [3H]-tamoxifen
    • Tamoxifen, 7
    • [3H]tamoxifen
    • tamoxifene citrate
    • Teva-tamoxifen
    • Dom-tamoxifen
    • Tadex
    • Mylan-tamoxifen
    • Bilem
    • Ebefen
    • Adopan
    • Adifen
    • Tomifen
    • Tecnotax
    • Tamtero
    • Tamoxilon
    • Tamifen
    • Novofen
    • Mammonex
    • Gynatam
    • Fenahex
    • Tamoneprin
    • Doctamoxifene
    • CAS-10540-29-1
    • Ethanamine, 2-[4-[(1Z)-1,2-diphenyl-1-butenyl]phenoxy]-N,N-dimethyl-
    • Ethanamine, 2-(4-((1Z)-1,2-diphenyl-1-butenyl)phenoxy)-N,N-dimethyl-
    • 2-[4-[(Z)-1,2-diphenylbut-1-enyl]phenoxy]-N,N-dimethyl-ethanamine
    • 1-p-.beta.-Dimethylamino-ethoxyphenyl-trans-1,2-diphenylbut-1-ene
    • (Z)-2-[p-(1,2-Diphenyl-1-butenyl)phenoxy]-N,N-dimethylethylamine
    • (Z)-2-(4-(1,2-diphenylbut-1-enyl)phenoxy)-N,N-dimethylethanamine
    • TAMOXIFEN (TAMOXIFEN CITRATE (54965-24-1))
    • W-108788
    • BRD-K93754473-048-05-3
    • BRD-K93754473-001-02-9
    • L024126
    • Ethylamine, N,N-dimethyl-2-(p-(1,2-diphenyl-1-butenyl)phenoxy)-, (Z)-
    • D08559
    • 2-[4-[(Z)-1,2-diphenylbut-1-enyl]phenoxy]-N,N-dimethylethanamine
    • 13002-65-8
    • MFCD00010454
    • 2-{4-[(1Z)-1,2-diphenylbut-1-en-1-yl]phenoxy}-N,N-dimethylethanamine
    • (Z)-2-(para-(1,2-Diphenyl-1-butenyl)phenoxy)-N,N-dimethylamine (IUPAC)
    • trans-2-[4-(1,2-Diphenyl-1-butenyl)phenoxy]-N,N-dimethylethylamine
    • HMS2090N08
    • HMS1990J11
    • HMS1792J11
    • HMS1362J11
    • 54965-24-1 (citrate)
    • TRANS FORM OF TAMOXIFEN
    • BIDD:GT0009
    • BIDD:ER0008
    • Ethanamine, 2-(4-(1,2-diphenyl-1-butenyl)phenoxy)-N,N-dimethyl-, (Z)-
    • BIDD:PXR0003
    • (Z)-2-(4-(1,2-Diphenyl-1-butenyl)phenoxy)-N,N-dimethylethanamine
    • 1-para-beta-Dimethylaminoethoxyphenyl-trans-1,2-diphenylbut-1-ene
    • ICI-46,474
    • UPCMLD-DP027
    • 1-p-beta-Dimethylaminoethoxyphenyl-trans-1,2-diphenylbut-1-ene
    • ICI-47699
    • 1ya4
    • Tocris-0999
    • Tamoplex (TN)
    • Tamoxifen (INN)
    • ICI-46474
    • Tamoxifen (TN)
    • Gen-Tamoxifen
    • Novo-Tamoxifen
    • Tamoxifen [INN:BAN]
    • Tamone
    • Nourytam
    • C26H29NO
    • ICI 47699
    • Tamoxifen and its salts
    • Nolvadex-D
    • Pms-Tamoxifen
    • Tomaxithen
    • Novaldex
    • Tamoxifeno [INN-Spanish]
    • Tamoxifenum [INN-Latin]
    • Tamoxifene [INN-French]
    • Tamoxifen (Z)
    • Retaxim
    • Istubol
    • Tamoxifenum
    • Tamoxifeno
    • trans-Tamoxifen
    • Valodex
    • Tamoxen
    • Tamizam
    • Oncomox
    • Diemon
    • Citofen
    • Tamoxifene
    • Soltamox
    • Crisafeno
    • 10540-29-1
    • tamoxifen

Tamoxifen Identification Summary Frequently Asked Questions (FAQs)

What’s the formula of tamoxifen?
C26H29NO
How many atoms and what are the elements in the tamoxifen molecule?
57 atom(s) - 29 Hydrogen atom(s), 26 Carbon atom(s), 1 Nitrogen atom(s), and 1 Oxygen atom(s)
How many chemical bonds and what types of bonds are in the tamoxifen structure?
59 bond(s) - 30 non-H bond(s), 19 multiple bond(s), 8 rotatable bond(s), 1 double bond(s), 18 aromatic bond(s), 3 six-membered ring(s), 1 tertiary amine(s) (aliphatic), and 1 ether(s) (aromatic)
What’s the molar mass of tamoxifen?
371.51456 g/mol
What’s the SMILES format of tamoxifen?
CCC(=C(c1ccccc1)c2ccc(OCCN(C)C)cc2)c3ccccc3
What’s the InChI format of tamoxifen?
InChI=1S/C26H29NO/c1-4-25(21-11-7-5-8-12-21)26(22-13-9-6-10-14-22)23-15-17-24(18-16-23)28-20-19-27(2)3/h5-18H,4,19-20H2,1-3H3/b26-25-
What’s the InChIKey string of tamoxifen?
NKANXQFJJICGDU-QPLCGJKRSA-N

1001 The contents of this page can freely be shared if cited as follows:
Source: Chemical Compounds Deep Data Source (CCDDS; https://www.molinstincts.com) based on 41 patented QSQN and QN technology
commercialized into Mol-Instincts database and ChemRTP, ChemEssen, Inc (2024).

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