1-(2,4-Diketo-1,3-dimethyl-1,2,3,4-tetrahydropyrimidin-6-yl)-3-isobutyl-2-thiourea 1-Isobutyl-3-(1,2,3,6-tetrahydro-1,3-dimethyl-2,6-dioxo-4-pyrimidinyl)-2-thiourea 31683-83-7 Uracil, 1,3-dimethyl-5-(isobutylthiourea)- Urea, 1-isobutyl-3-(1,2,3,6-tetrahydro-1,3-dimethyl-2,6-dioxo-4-pyrimidinyl)-2-thio-