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organic compounds
The two unsymmetrically substituted thiourea derivatives, 1,1-dimethyl-3-o-tolylthiourea, C10H14N2S, and 1,1-diethyl-3-o-tolylthiourea, C12H18N2S, both crystallize in the orthorhombic space group P212121 and have the same type of crystal packing. In both structures, N—HS hydrogen bonds link the molecules into chains along the b axis.