[{"from": "human", "value": "Write number-averaged molecular weight of given SMILES at normal measurement conditions.. ->  O=C1N(CC(CCCCCCCCCC)CCCCCCCC)C(C2=C(C3=CC(SC(C)=C4)=C4S3)SC(C5=CC(S6)=C(S5)C=C6C7=CC8=C(OCC(CCCC)CC)C9=C(C=C(C)S9)C(OCC(CCCC)CC)=C8S7)=C21)=O\n"}, {"from": "gpt", "value": " 1181\n"}]