D-Aspartic acid dibenzyl ester tosylate4079-64-532 % similar L-Isoleucine benzyl ester p-toluenesulfonate16652-75-831 % similar O-Benzyl-L-tyrosine toluene-p-sulphonate53587-11-430 % similar Glycylglycine benzyl ester p-toluenesulfonate1738-82-530 % similar Poly(4-styrenesulfonic acid)28210-41-530 % similar