[{"from": "human", "value": "Given SMILES, write its Mw at room temperature and atmospheric pressure. ->  CC1=CC(N(C(CCCCCCCC)CCCCCCCC)C2=CC(C3=CC=C(C4=CC=C(C5=CC=C(C)S5)C6=C4N=C(C7=CC=C(CCCCCCCC)S7)C(C8=CC=C(CCCCCCCC)S8)=N6)S3)=CC=C29)=C9C=C1\n"}, {"from": "gpt", "value": " 25.8\n"}]