Q: How many heavy (non-hydrogen) atoms does this compound have?
 The Molecule has the SMILES Nc1ncnc2c1ncn2CCOCP(=O)(O)O.
Answer: 18
{#Question|Q!}: {quest#}
{#Constraint:|Description:|!} The {#Molecule|Compound|Chemical!} {#has the|can be represented with the!} {SMILES__description} {SMILES#}.
{#Answer|Result|Answer!}: {answ#}
Nc1ncnc2c1ncn2CCOCP(=O)(O)O
Nc1ncnc2c1ncn2CCOCP(=O)(O)O
9-[2-(phosphonomethoxy)ethyl]purin-6-amine
How many heavy (non-hydrogen) atoms does this compound have?
18