(Methylamino)acetaldehyde dimethylacetal 98%2,2-Dimethoxy-N-methylethylamine1,1-Dimethoxy-2-(methylamino)ethaneMETHYLAMINOACETALDEHYDE DIMETHYLACETAL2,2-dimethoxy-N-methylethanamineN-甲基氨基乙醛二甲基乙缩醛甲氨基乙醛缩二甲醇1,1-Dimethoxy-2-methylaminoethane(2,2-dimethoxyethyl)(methyl)amine(Methylamino)acetaldehyde dimethyl acetal甲氨基乙醛缩二甲醛N-甲基氨基乙醛二甲基乙缩醛