[{"from": "human", "value": "What is Mw of given SMILES at room temperature and atmospheric pressure? ->  CC1=CC([Si](CC(CCCC)CC)(CC(CC)CCCC)C2=C3SC(C4=CC=C(C)C5=NSN=C45)=C2)=C3S1\n"}, {"from": "gpt", "value": " 21.6\n"}]