Flavone‐3′‐sulfon­amide

In the title mol­ecule, C₁₅H₁₁NO₄S, the phenyl and benzene rings are quite planar, with maximum deviations from planarity of 0.009 (2) and 0.004 (1) Å, respectively. The γ‐pyrone ring deviates from planarity and makes a dihedral angle of 8.3 (3)° with the 2‐phenyl substituent. The sulfon­amide group is involved in N—H?O hydrogen bonding.