2-(tert-Butoxycarbonylamino)-6-(1,3-dioxo-1H-2,3-dihydrobenzo[de]isoquinolin-2-yl)hexanoic acid

In the title naphthalimide derivative, C23H26N2O6, the 1,8naphthalimide system is essentially planar [maximum deviation = 0.0456 (16) A]. A characteristic pattern of alternating long and short C—C bond lengths is observed in the 1,8naphthalimide unit. The mean planes through the methyl carbamate and acetic acid groups form dihedral angles of 42.30 (9) and 61.59 (9) , respectively, with the 1,8-naphthalimide plane. In the crystal structure, intermolecular O—H O and C—H O hydrogen bonds link neighbouring molecules, forming R2 (9) hydrogen-bond ring motifs. These rings are further interconnected by intermolecular N—H O and C— H O hydrogen bonds into a three-dimensional supramolecular network.