1-Phenyl-2-oxo-3-oxabicyclo[3.1.0]hexane63106-93-431 % similar 2-[4-[4-[4-(Hydroxydiphenylmethyl)-1-piperidinyl]-1-oxobutyl]phenyl]-2,2-dimethylacetic acid methyl ester154477-55-131 % similar Tiotropium bromide hydrate139404-48-131 % similar Ipratropium bromide monohydrate66985-17-931 % similar Propiverine hydrochloride54556-98-830 % similar