Anti-hypertensive 9-aminomethyl-benzo[f]quinoline-3,10-dione derivatives

A benzo[f]quinoline derivative of the formula:

• ##STR10## wherein R.sup.1 is hydrogen or lower alkyl, R.sup.2 is hydrogen, lower alkyl, hydroxy-lower-alkyl or lower-alkoxy-lower-alkyl, R.sup.3 and R.sup.4 are the same or different and each is hydrogen, lower alkyl, halogen, lower alkoxy, benzyloxy or hydroxy, R.sup.5 and R.sup.6 are the same or different and each is hydrogen, straight or branched C.sub.1-10 alkyl, pheny-C.sub.1-4 alkyl or C.sub.5-6 cycloalkyl, or R.sup.5 and R.sup.6 together with the adjacent nitrogen atom form a pyrrolidine, piperidine, morpholine, N'-methylpiperazine, or 6,7-dimethyl-1,2,3,4,-tetrahydroisoquinoline, and the dotted line in the ring is an optional bond between the 1- and 2-positions, or a pharmaceutically acceptable acid addition salt thereof.