1,8-Diamino-P-menthane80-52-4100 % similar 1-Methylcyclopropylamine hydrochloride88887-87-044 % similar 1-Amino-1-methylcyclobutane hydrochloride174886-05-641 % similar 2-Amino-2-methyl-1,3-propanediol115-69-533 % similar