d ( - ) s-and l ( + ) r-tropinoylcholines were synthesized and their antagonisms to acetylcholine ( ach ) were studied at muscarinic receptors ( guinea-pig longitudinal ileal muscle ) , acetylcholinesterase ( ache ) and pseudocholinesterase ( che ) .
C0001044
acetylcholinesterase
C0008429
pseudocholinesterase