the effects of intraperitoneal injections of a precursor ( l-dopa ) and some inhibitors of monoamine oxidation ( pargyline ) , decarboxylation ( ro4-4602 ) and hydroxylation ( iprindole , imipramine and para chlorophenylalanine ( pcpa ) are consistent with the interpretation that pe arises essentially as a result of decarboxylation of phenylalanine , pta by hydroxylation of pe and mta by dehydroxylation ( and decarboxylation ) of a catechol .
C0030135
para chlorophenylalanine
C0031453
phenylalanine