[{"from": "human", "value": "Given SMILES, write its band gap at normal measurement conditions.. ->  CC1=CC([Si]2(CCCCCCCC)CCCCCCCC)=C(S1)C3=C2C=C(S3)C4=CC(CCCCCCCC)=C(C5=NC(SC(C6=C(CCCCCCCC)C=C(C)S6)=N7)=C7S5)S4\n"}, {"from": "gpt", "value": " 1.79\n"}]