User: I have a question about the chemical with SMILES CCNC(=O)[C@H]1O[C@@H](n2cnc3c(N)nc(C#CC[C@H]4CC[C@H](C(=O)OC)CC4)nc32)[C@H](O)[C@@H]1O.
Assistant: That sounds interesting, how can I help?
User: Determine if this drug is administered as a racemic mixture, a single stereoisomer, an achiral molecule, or has an unknown chirality.
Assistant: Single stereoisomer
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#}
CCNC(=O)[C@H]1O[C@@H](n2cnc3c(N)nc(C#CC[C@H]4CC[C@H](C(=O)OC)CC4)nc32)[C@H](O)[C@@H]1O
CCNC(=O)[C@H]1O[C@@H](n2cnc3c(N)nc(C#CC[C@H]4CC[C@H](C(=O)OC)CC4)nc32)[C@H](O)[C@@H]1O
methyl 4-[3-[6-amino-9-[(2R,3R,4S,5S)-5-(ethylcarbamoyl)-3,4-dihydroxyoxolan-2-yl]purin-2-yl]prop-2-ynyl]cyclohexane-1-carboxylate
Determine if this drug is administered as a racemic mixture, a single stereoisomer, an achiral molecule, or has an unknown chirality.