[STUDIES OF REARRANGEMENT REACTION. VI. RING CONTRACTION  REACTION FROM PYRIDAZONE DERIVATIVES TO PYRAZOLONE DERIVATIVES].
D002626:Chemistry, Pharmaceutical; D010604:Pharmacy; D011720:Pyrazoles; D047069:Pyrazolones; D011724:Pyridazines
D011720:Pyrazoles; D047069:Pyrazolones; D011724:Pyridazines
CHEMISTRY, PHARMACEUTICAL; PYRAZOLES; PYRIDAZINES