Text this: Synthesis and gastroprotective activities of some zinc (II) complexes derived from (E)-2-(1-(2-(piperazin-1-yl) ethylimino)ethyl)phenol and (E)-4-(1-(2-(piperazin-1-yl) ethylimino)ethyl)benzene-1,3-diol Schiļ¬€ bases against aspirin induced ulceration