User: I have a question about the chemical with SMILES O[C@@H]1CO[C@H]2[C@@H]1OC[C@@H]2O.
Assistant: How can I help?
User: How many hydrogen bond acceptors are there in this compound, calculated according to Lipinski's original rules (i.e., counting N and O atoms)?
Assistant: The answer is 4
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#}
O[C@@H]1CO[C@H]2[C@@H]1OC[C@@H]2O
O[C@@H]1CO[C@H]2[C@@H]1OC[C@@H]2O
(3S,3aR,6R,6aR)-2,3,3a,5,6,6a-hexahydrofuro[3,2-b]furan-3,6-diol
How many hydrogen bond acceptors are there in this compound, calculated according to Lipinski's original rules (i.e., counting N and O atoms)?