User: I have a question about the compound with SMILES N[C@@H](CCS(=O)(=O)O)CSSC[C@@H](N)CCS(=O)(=O)O.
Assistant: Interesting, how can I help?
User: How many heavy (non-hydrogen) atoms does this compound have?
Assistant: 20
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#}
N[C@@H](CCS(=O)(=O)O)CSSC[C@@H](N)CCS(=O)(=O)O
N[C@@H](CCS(=O)(=O)O)CSSC[C@@H](N)CCS(=O)(=O)O
(3S)-3-amino-4-[[(2S)-2-amino-4-sulfobutyl]disulfanyl]butane-1-sulfonic acid
How many heavy (non-hydrogen) atoms does this compound have?
20