Molecular structure of 5,7-di(<Emphasis Type="Italic">tert</Emphasis>-butyl)-2-(6,8-dimethyl-4-chloroquinoline-2-yl)-3-hydroxytropone with two tautomeric forms

The structure of 5,7-di(tert-butyl)-2-(6,8-dimethyl-4-chloroquinoline-2-yl)-3-hydroxytropone with a hydrogen atom, possibly equally distributed over two N and O centers and involved in the intramolecular hydrogen bond, is determined by the single crystal X-ray diffraction analysis.