TABLE 5.

MS fragmentation analysis of metabolites produced by S. hygroscopicus LEK111 grown in the presence of 4-hydroxyproline

Compoundb	m/z (M + Na+)	Inferred mass differencea after loss of fragmentc:
		X	Y	Z
I	936	129	294	322
IIIa	938	131	294	322
IIIb	908	131	264	322

^aMass difference (in amu) calculated by subtracting the mass of the observed daughter ion from the mass of the observed parent ion. 

^bCompound designations are defined in Fig. 1 (compound I) and Fig. 5 (compounds IIIa and IIIb). 

^cFragments X, Y, and Z are shown in Fig. 5.