Received 25 February 2011
There are four molecules in the asymmetric unit of the title compound, C16H17N3O4, in which the dihedral angles between the indole ring system and maleimide ring are 4.5 (3), 8.3 (3), 8.4 (2) and 10.4 (2)°. In the crystal, molecules are linked by numerous N-HO and O-HO hydrogen bonds, generating a three-dimensional network.
Data collection: SMART (Bruker, 2003); cell refinement: SAINT (Bruker, 2003); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HB5807 ).
We thank the Scientific Research Foundation for Returned Overseas Chinese Scholars, State Education Ministry of China (No. 890) for financial support.
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