Pyrrolidine-1,2-dicarboxylic acid 2-{2-[5-tert-butoxycarbonyl-2-(dimethylamino-methyleneamino)-4-oxo-3,4,5,6,7,8-hexahydro-pteridin-6-yl]-2-hydroxy-1-methyl-ethyl}ester 1-tert-butyl ester (HCID 136330182)|Huagongshe