Refinement. Aromatic H atoms were placed in idealized positions and allowed to ride on their respective parent atoms, with C–H = 0.95 (CaromH) and with Uiso(H) = kUeq(carrier atom), where k = 1.2 for CH. The H atoms attached to methyl C7 are disordered over two sites. These were freely refined; the occupancy of the major disorder component is 0.69 (5). The highest peak and deepest hole in the final difference map were located 0.93 Å from atom H7B and 0.32 Å from atom H7A, respectively.