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, C14H14Cl2N2O4, (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, C14H14Cl2N2O4, (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.