K. Goubitz et al., CRYSTAL-STRUCTURE OF XY-1-(TOLUENE-4-SULFONYL)-1,5-DIHYDROPYRROL-2-ONE, C14H17NO4S AND OF ITS CIS-TETRACARBONYLIRON COMPLEX, FE(CO)(4)(C14H17NO4S), Zeitschrift fur Kristallographie, 211(10), 1996, pp. 714-716
Source of material: grown from EtOAc/Ether/Pentane. The synthetic and
chemical aspects of both compounds are reported elsewhere (see ref. 6)
and references cited therein.