4-[(E)-(4-Hy-droxy-2-oxo-2H-chromen-3-yl)methyl-idene-amino]-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one monohydrate.

4-[(E)-(4-Hy-droxy-2-oxo-2H-chromen-3-yl)methyl-idene-amino]-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one monohydrate.