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In the title mol­ecule, C20H18N2O3, the pyrazole ring forms a dihedral angle of 2.2 (1)° with its meth­oxy­phenyl substituent and a dihedral angle of 67.2 (1)° with the benzene substituent on the propenal unit. In the crystal, mol­ecules are connected by weak C—H...O hydrogen bonds, forming R22(26) and R22(28) cyclic dimers that lie about crystallographic inversion centres. These dimers are further linked through C—H...O and C—H...N hydrogen bonds, forming C(8), C(9), C(10) and C(16) chain motifs. These primary motifs are further linked to form secondary C22(15) chains and R22(18) rings.

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In the crystal of the title compound, C11H12O5S2, mol­ecules are linked by O—H...O hydrogen bonds and C—H...O inter­actions, forming a three-dimensional network.
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