[{"from": "human", "value": "Write number-averaged molecular weight of given SMILES at normal measurement conditions.. ->  CC1=CC2=C(C(C=CC(C3=CC(/C=C/C4=CC=C(/C=C(C(OCCCCCCCC)=O)\\C#N)S4)=C(C)S3)=C5)=C5N2C(CCCCCCCC)CCCCCCCC)C=C1\n"}, {"from": "gpt", "value": " 16\n"}]