Di-n-but-yl[4-hy-droxy-N'-(3-meth-oxy-2-oxido-benzyl-idene-κO (2))benzo-hydrazidato-κ(2) N,O]tin(IV).

In the title compound, [Sn(C4H9)2(C15H12N2O4)], the Sn(IV) atom is coordinated by the N, O and O' atoms from the tridentate Schiff base dianion in an overall cis-C2SnNO2 trigonal-bipyramidal geometry. Adjacent mol-ecules are linked by O-H⋯O hydrogen bonds, forming a chain running along [001].