Abstract: Novel 6-amino-7-hydroxy-4,5,6,7-tetrahydro-imidazo[4,5,l-j-k][1]-benzazepin-2-(1 H)-one derivatives of the formula ##STR1## wherein R is selected from the group consisting of hydrogen, alkyl of 1 to 8 carbon atoms optionally substituted with a hydroxyl, aryl and aryloxy of 6 to 10 carbon atoms, cycloalkyl of 3 to 7 carbon atoms optionally interrupted with a heteroatom optionally substituted with alkyl of 1 to 4 carbon atoms and the wavy lines indicates that the 7-OH and 6-amino have the trans configuration and their non-toxic, pharmaceutically acceptable acid addition salts having remarkable anti-hypertensive and hypotensive activity and vasodilatatory activity and their preparation.

Abstract: Novel trans cyclohept[c,d]indolols of the formula ##STR1## wherein R is selected from the group consisting of hydrogen, alkyl of 1 to 5 carbon atoms and optionally substituted aralkyl of 7 to 12 carbon atoms and R.sub.1 is selected from the group consisting of hydrogen, alkyl of 1 to 5 carbon atoms, cycloalkylalkyl of 4 to 7 carbon atoms and optionally substituted aralkyl of 7 to 12 carbon atoms and their non-toxic, pharmaceutically acceptable acid addition salts having hypotensive and antihypertensive activity and a process for their preparation.