abstract |
Pyroglutamic acid derivatives and analogs having the formula ##STR1## and salts thereof, wherein R is hydrogen, alkyl or diphenylmethyl; n R 1 is hydrogen, alkyl or trifluoromethyl; n R 2 is hydrogen, ##STR2## or ##STR3## R 3 is hydrogen, alkyl, phenyl, or phenylalkyl; X is oxygen or sulfur; and n n is 0 or 1; n have useful hypotensive activity. |