| abstract |
<IMAGE> wherein R1 is straight or branched alkyl of 1 to 4 carbon atoms; R2 is hydrogen, halogen, amino, nitro, alkoxy of 1 to 3 carbon atoms, -COOR6, 3-methyl or 4-methyl; R4 and R5 are each alkyl of 1 to 4 carbon atoms or, together with each other and the nitrogen atom to which they are attached, piperidino, pyrrolidino or morpholino; R6 is alkyl of 1 to 3 carbon atoms; and n is 2 or 3; and non-toxic, pharmacologically acceptable acid addition salts thereof. The compounds as well as their salts are useful as sleep potentiators and blood circulation enhancers. |