User: I want to know more about the chemical with SMILES Cn1c(COP(=O)(NCCBr)NCCBr)cnc1[N+](=O)[O-].
Assistant: Interesting, how can I help?
User: How many heavy (non-hydrogen) atoms does this compound have?
Assistant: The answer is 21
User: I want to know more 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#}
Cn1c(COP(=O)(NCCBr)NCCBr)cnc1[N+](=O)[O-]
Cn1c(COP(=O)(NCCBr)NCCBr)cnc1[N+](=O)[O-]
2-bromo-N-[(2-bromoethylamino)-[(3-methyl-2-nitroimidazol-4-yl)methoxy]phosphoryl]ethanamine
How many heavy (non-hydrogen) atoms does this compound have?
21