User: I have a question about the chemical with SMILES C[C@H](Cn1cnc2c(N)ncnc21)OCP(=O)(O)O.
Assistant: Interesting, how can I help?
User: How many heavy (non-hydrogen) atoms does this compound have?
Assistant: The answer is 19
User: I have a question about the {#molecule|chemical|compound!} with {SMILES__description} {SMILES#}.
Assistant: {#Sure, what is your question?|How can I help?|That sounds interesting, how can I help?|Interesting, how can I help?!}
User: {quest#}
Assistant: {#The answer is |!}{answ#}
C[C@H](Cn1cnc2c(N)ncnc21)OCP(=O)(O)O
C[C@H](Cn1cnc2c(N)ncnc21)OCP(=O)(O)O
[(2R)-1-(6-aminopurin-9-yl)propan-2-yl]oxymethylphosphonicacid
How many heavy (non-hydrogen) atoms does this compound have?