[{"from": "human", "value": "Given SMILES, write its Mw at normal measurement conditions.. ->  CC1=CC([Si](CC(CCCC)CC)(CC(CCCC)CC)C2=C3SC(C4=C5C(C(C(C=C(CCCCCC)C(CCCCCC)=C6)=C6C5=O)=O)=C(C)S4)=C2)=C3S1\n"}, {"from": "gpt", "value": " 826\n"}]