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Crystal Structure of the Chiral Azomethine Imine, (Z)-( S )-4- (tert -Butylcarbonylamino)-2-(2-methoxybenzylidene)-5-oxopyrazolidin-2-ium-1-ide, Obtained by the Cyclization of tert -Butyl ( S )-2-[2-(methoxybenzylidene)hydrazine]-1-(hydroxymethyl)-2-ox...