qb proved to be a noncompetitive inhibitor of both acetylcholinesterase ( or true cholinesterase ) and butyrylcholinesterase ( or pseudocholinesterase ) having a ki = 0.5 x 10 ( -6 ) m for acetylcholinesterase and 1.5 x 10 ( -6 ) m for butyrylcholinesterase .
C0001044
acetylcholinesterase
C0008429
butyrylcholinesterase