[{"from": "human", "value": "Given SMILES, write its band gap at room temperature and atmospheric pressure. ->  O=C1N(CC(CCCCCCCCCC)CCCCCCCC)C(C2=C(C3=CC=C(C4=CC=C(C)S4)S3)SC(C5=CC=C(S5)C6=CC=C(C7=CC8=C(OCC(CCCC)CC)C9=C(C=C(C)S9)C(OCC(CCCC)CC)=C8S7)S6)=C21)=O\n"}, {"from": "gpt", "value": " 1.6\n"}]