[{"from": "human", "value": "What is solar cell fill factor of given SMILES? ->  CC1=CC=C(C2=C(C3=CC=C(C[C@H](CCCC)CC)S3)C=C(C4=CC(C5=CC=C(CC(CCCC)CC)S5)=C(C)S4)S2)C6=NSN=C16\n"}, {"from": "gpt", "value": " P4TBT\n"}]