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The title compound, C 33 H 34 N 4 O 2 S·CH 3 OH, was prepared as a spiro­lactam ring formation of rhodamine 6 G dye for comparison with a ring-opened form. The xanthene and spiro­lactam rings are approximately planar [r.m.s. deviations from planarity = 0.122 (3) and 0.072 (6) Å, respectively]. The dihedral angles formed by the spiro­lactam and thio­phene rings with the xanthene ring system are 89.7 (6) and 86.5 (2)°, respectively. The crystal structure features N—H⋯O and C—H⋯O hydrogen bonds.

3′,6′-Bis(ethylamino)-2′,7′-dimethyl-2-{2-(E)-[(thiophen-2-yl)methylideneamino]ethyl}spiro[isoindoline-1,9′-xanthen]-3-one methanol monosolvate