3,4-trans-2,2-Dimethyl-3-phenyl-4-p-(beta-pyrrolidinoethoxy)phenyl-7-methoxychroman HCl 51023-56-4 67/20CDRI Centchroman hydrochloride Centhchroman hydrochloride Chroman, 3,4-trans-2,2-dimethyl-3-phenyl-4-p-(beta-pyrrolidinoethoxy)phenyl-7-methoxy-, hydrochloride