1568 ELDERFIELD, GENSLER, BEMBRY, BRODY, WTEDERIIOLD AND NEWMAN Vol. 68 and dried to give 4.2 g.(64%). A singp crystallization brought the melting point up to 217- 219. This material contained a persistent impurity, presumably R-36, and only after seven crystallizations was the melting point raised to 232" dec., mixed melting point with the previous preparation (R-120) from trimethylene diamine and 8-(3-chloropropylamino)-6- ...