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Our work in the area of synthesis of tris indole compounds as a potential chelator led to the synthesis and crystallization of ethyl 1 H -indole-2-carboxylate, C 11 H 11 NO 2 , an indole that was synthesized by the thionyl chloride reaction of 1 H -indole-2-carboxylic acid, followed by dissolution in ethanol. The molecular packing exhibits a herringbone pattern with the zigzag running along the  b -axis direction; the compound crystallizes as a hydrogen-bonded dimer resulting from O...H—N hydrogen bonds, between the indole N—H group and the keto oxygen atom, which build centrosymmetric  R 2 2 (10) ring motifs in the crystal.

Ethyl 1H-indole-2-carboxylate