5 PY 6 Q pyridin 2 amines or pharmaceutically acceptable acid addition salts thereof are useful cardiotonics, where Q is hydrogen or lower alkyl, and PY is 4 pyridinyl or {HEAD ~ 4 pyridinyl} having {TAIL ~ one or two lower alkyl substituents} 
5 PY 6 Q pyridin 2 amines or pharmaceutically acceptable acid addition salts thereof are useful cardiotonics , where Q is hydrogen or lower alkyl , and PY is 4 pyridinyl or { HEAD ~ 4 pyridinyl } having { TAIL ~ one or two lower alkyl substituents }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL