Mesit­yl(2,4,6-trimeth­oxy­phen­yl)borinic acid

In the title mol­ecule, C(18)H(23)BO(4), the dihedral angle between the least-squares planes of the aromatic rings is 84.88 (3)°. The B atom deviates by 0.202 (1) Å from the least-squares plane of the mesityl ring. All of the meth­oxy groups are approximately coplanar with the 2,4,6-trimeth­oxy­phenyl ring, whereas the BOH group is twisted with respect to it by 19.5°. The borinic OH group is engaged in an intra­molecular O—H⋯O hydrogen bond with one of ortho-meth­oxy groups. The mol­ecular structure is stabilized by weak C—H⋯O contacts. In the crystal, mol­ecules are linked by weak C—H⋯O and C—H⋯π inter­actions, generating a three-dimensional network.