buthionine sulfoximine ( s-n-butyl homocysteine sulfoximine ) , the most potent of a series of analogs of methionine sulfoximine thus far studied ( griffith , o.w. , anderson , m.e. , and meister , a . ( 1979 ) j. biol . chem . 254 , 1205-1210 ) , inhibited gamma-glutamylcysteine synthetase about 20 times more effectively than did prothionine sulfoximine and at least 100 times more effectively than methionine sulfoximine .
C0054252
buthionine sulfoximine
C0017037
gamma-glutamylcysteine synthetase