1: 2-(2,2-diethoxyethoxy)-1,1-dimethoxyethane; [14C]-N-Benzylamine hydrochloride With hydrogenchloride; dipotassium hydrogenphosphate; acetic acid; citric acid in water T=0 - 5°C; Mannich Reaction; 2: acetone-1,3-dicarboxylic acid in water T=20°C; Mannich Reaction; pH=4;