1-(3-Hydroxy-5-methyl-4-phenylhexyl)-1-methylpiperidinium bromide 520-20-7 Darstine Darstine bromide MEPIPERPHENIDOL Mepiperphenidol bromide Mepiperphenidyl NSC 17126 Piperidinium, 1-(3-hydroxy-5-methyl-4-phenylhexyl)-1-methyl-, bromide Piperphenamine