Racemic and chiral 1-[N-(chloroacetyl)carbamoylamino]-2, 3-dihydro-1H-inden-2-yl chloroacetate.

In the racemic crystals of (1S,2R)- or (1R, 2S)-1-[N-(chloroacetyl)carbamoylamino]-2,3-dihydro-1H-inden- 2-yl chloroacetate, C(14)H(14)Cl(2)N(2)O(4), (I), the enantiomeric molecules form a dimeric structure via the N-H.O cyclic hydrogen bond of the carbamoyl moieties. In the chiral crystals of (-)-(1S, 2R)-1-[N-(chloroacetyl)carbamoylamino]-2,3-dihydro-1H-inden- 2-yl chloroacetate, C(14)H(14)Cl(2)N(2)O(4), (II), the N-H.O intermolecular hydrogen bond forms a zigzag chain around the twofold screw axis. The melting points and calculated densities of (I) and (II) are 446 and 396 K, and 1.481 and 1.445 Mg m(-3), respectively.