The synthesis and crystal structure of 4- (2' - Hydroxybenzoylhydrazinyl) benzal-5-methyl-2-phenyl-2, 4-dihydropyrazol- 3-one (B_1) and 4-(2'-hydroxybenzoylhydrazinyl) ethylidene-5-methyl-2- phenyl-2,4-dihydropyrazol-3-one