N-[7-ethyl-6-(2-methyl-2H-pyrazol-3-yl)-2,4-dioxo-1,4-dihydro-2H-quinazolin-3-yl]-methanesulfonamide 、
氯甲酸异丁酯 以to yield methanesulfonyl-[7-ethyl-6-(2-methyl-2H-pyrazol-3-yl)-2,4-dioxo-1,4-dihydro-2H-quinazolin-3-yl]-carbamic acid isobutyl ester的产率得到methanesulfonyl-[7-ethyl-6-(2-methyl-2H-pyrazol-3-yl)-2,4-dioxo-1,4-dihydro-2H-quinazolin-3-yl]-carbamic acid isobutyl ester