[{"from": "human", "value": "Given SMILES, write its number-averaged molecular weight at normal measurement conditions.. ->  CC(S1)=CC2=C1C(OCCCCCCCCCCCC)=C(C=C(C3=C4C(N=CC=N4)=C(C)S3)S5)C5=C2OCCCCCCCCCCCC\n"}, {"from": "gpt", "value": " 34.6\n"}]