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(a) Compound 16m with large side chain group and the binding sites of glycerol (GOL) in mt-DHFR, in which compound 16m is represented as a sticks model, GOL as a dotted line model and protein as a molecular surface; (b,c) the small side chain group of compound 16f can fit into the GOL binding site, in which the molecule is represented as sticks and protein as a molecular surface.
