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Molecular formula

C18H21N3O9

2 compounds have this formula on CompoundList.

Molar mass
423.38g/mol
Monoisotopic mass
423.1278Da
Atoms
51
Elements
4
Rings plus double bonds
10

The formula C18H21N3O9 describes a molecule made of 18 carbon atoms, 21 hydrogen atoms, 3 nitrogen atoms and 9 oxygen atoms. It is written in Hill notation: carbon first, then hydrogen, then the other elements in alphabetical order. The formula tells you which atoms are present, not how they are connected, which is why several different chemicals can share it.

Elemental composition

  • C Carbon × 1851.07%
    12.011 × 18 = 216.198 g/mol
  • H Hydrogen × 215.00%
    1.008 × 21 = 21.168 g/mol
  • N Nitrogen × 39.93%
    14.007 × 3 = 42.021 g/mol
  • O Oxygen × 934.01%
    15.999 × 9 = 143.991 g/mol
Look up another formula

Compounds with the formula C18H21N3O9

Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.

Showing 1 to 2 of 2 compounds

(2,4,6-Trioxo-1,3,5-triazinane-1,3,5-triyl)triethane-2,1-diyl trisprop-2-enoate chemical structure, C18H21N3O9, CAS 40220-08-4
(2,4,6-Trioxo-1,3,5-triazinane-1,3,5-triyl)triethane-2,1-diyl trisprop-2-enoate
CAS 40220-08-4C18H21N3O9
Methyl 5-(cyanomethyl)-3-[3,4-diacetyloxy-5-(acetyloxymethyl)oxolan-2-yl]imidazole-4-carboxylate chemical structure, C18H21N3O9, CAS 58459-34-0
Methyl 5-(cyanomethyl)-3-[3,4-diacetyloxy-5-(acetyloxymethyl)oxolan-2-yl]imidazole-4-carboxylate
CAS 58459-34-0C18H21N3O9

Frequently asked questions

What is the molar mass of C18H21N3O9?

The molar mass of C18H21N3O9 is 423.38 g/mol, calculated from standard atomic weights for 18 carbon atoms, 21 hydrogen atoms, 3 nitrogen atoms and 9 oxygen atoms. The monoisotopic mass is 423.1278 Da.

How many compounds have the formula C18H21N3O9?

CompoundList lists 2 compounds with the molecular formula C18H21N3O9, including (2,4,6-Trioxo-1,3,5-triazinane-1,3,5-triyl)triethane-2,1-diyl trisprop-2-enoate, Methyl 5-(cyanomethyl)-3-[3,4-diacetyloxy-5-(acetyloxymethyl)oxolan-2-yl]imidazole-4-carboxylate. Compounds that share a formula are isomers. They contain the same atoms arranged differently, so their properties, uses and prices can be very different.

What is the degree of unsaturation of C18H21N3O9?

C18H21N3O9 has a degree of unsaturation of 10. That is the total number of rings and pi bonds (a double bond counts as one, a triple bond as two) in any structure with this formula.