1-Propanaminium, 2-(acetyloxy)-N,N,N-trimethyl- 55-92-5 62-51-1 AMMONIUM, (2-HYDROXYPROPYL)TRIMETHYL-, ACETATE (ESTER) Acetylmethylcholine BRN 1769932 Choline, acetyl-beta-methyl- MCH Mecholin Mecholine Methacholin Methacholine Methacholinum beta-Methylacetylcholine