[(2-{[30,60-Bis(ethylamino)-20,70-dimethyl-3-oxospiro[1H-isoindole-1, 90-9H-xanthen]-2-yl}ethyl)aminomethyl]phenol

The title compound, C35H38N4O3, was prepared as a spiro-lactam ring formation of rhodamine dye for comparison with a ring-opened form. The xanthene ring system is approximately planar. The dihedral angles formed by the spiro-lactam and phenol rings with the xanthene ring system are 85.7 and 109.4°, respectively. Each of the mol-ecules in the crystal structure contains one intra-molecular O - H⋯N hydrogen bond, and they form inter-molecular N - H⋯O hydrogen-bonded chains along the [100] direction. Weak inter-molecular C - H⋯O hydrogen-bonding contacts connect the infinite chains via crystallographic inversion centres to form a two-dimensional network. © 2008 International Union of Crystallography.