Task: Answer the following question about the molecule with SMILES O=C(O)C(O)C(O)C(=O)O.Oc1ccc2c(c1)[C@@]13CCCC[C@@]1(O)[C@@H](C2)N(CC1CCC1)CC3.
Description: Please provide a description of this drug's mechanism of action.
Completion: Mu opioid receptor partial agonist
Task: Answer the following question about the molecule with {SMILES__description} {SMILES#}.
{#Description|Question|Request!}: {quest#}
{#Result|Answer|Completion!}: {answ#}
O=C(O)C(O)C(O)C(=O)O.Oc1ccc2c(c1)[C@@]13CCCC[C@@]1(O)[C@@H](C2)N(CC1CCC1)CC3
O=C(O)C(O)C(O)C(=O)O.Oc1ccc2c(c1)[C@@]13CCCC[C@@]1(O)[C@@H](C2)N(CC1CCC1)CC3
(1S,9R,10S)-17-(cyclobutylmethyl)-17-azatetracyclo[7.5.3.01,10.02,7]heptadeca-2(7),3,5-triene-4,10-diol;2,3-dihydroxybutanedioic acid
Please provide a description of this drug's mechanism of action.