11-Hy­droxy-9-(prop-2-en-1-yl)-9,10-dihydro-9,10-propano­anthracen-12-one

In the title compound, C(20)H(18)O(2), the central six-membered ring adopts a boat conformation and the terminal benzene rings make a dihedral angle of 42.66 (4)° with each other. In the crystal structure, the O—H group forms both an intra- and an inter­molecular O—H⋯O hydrogen bond; the former generates an S(5) ring and the latter leads to inversion-generated R (2) (2)(10) loops. The dimers are further linked into ribbons propagating along the a axis by C—H⋯O inter­actions, and the packing is consolidated by weak C—H⋯π inter­actions.