[{"from": "human", "value": "Given SMILES, write its number-averaged molecular weight at normal measurement conditions.. ->  CC1=CC=C(C2=CC=C(C3=CC=C(C4=C(OCCCCCCCCCCCCCC)C(OCCCCCCCCCCCCCC)=C(C)C5=NN(CCCCCCCCCCCCCC)N=C54)S3)C6=NSN=C62)S1\n"}, {"from": "gpt", "value": " 1066\n"}]