[{"from": "human", "value": "Write solar cell solar cell short-circuit current density of given SMILES. ->  CC(S1)=CC2=C1C(OCC(CCCCCCCC)CCCCCC)=C(C=C(C3=C(CC(CC)CCCC)C=C(C4=CC=C(C5=CC(CC(CC)CCCC)=C(C)S5)C6=NSN=C64)S3)S7)C7=C2C8=CC=C(OCC(CC)CCCC)C=C8\n"}, {"from": "gpt", "value": " PBDTDTBT-R\n"}]