1-Ethyl-3,3-dimethylspiro[indoline-2,8′-phenaleno[1,9-fg]chromene]

The title pyrene-fused spiropyran derivative, C30H25NO, crystallizes with two molecules in the asymmetric unit with dihedral angles between their fused-ring sub units of 76.20 (8) and 89.38 (9)°. In the crystal, weak C—H...π interactions link the molecules into a three-dimensional network.