FIGURE 3.

A: Extracted mass spectra 336.2 [M+H]⁺ of α-CEHC glycine in human urine (upper chromatogram) and synthesized standard (lower panel). B: α-CEHC glycine structure and calculated fragments. C: Extracted mass spectra 386.2 [M+H]⁺ of α-CEHC taurine in urine (upper chromatogram) and synthesized standard (lower panel). D: α-CEHC taurine structure and calculated fragments. E: Extracted mass spectra 407.2 [M+H]⁺ of α-CEHC glutamine in urine (upper chromatogram) and synthesized standard (lower panel). F: α-CEHC glutamine structure and calculated fragments. α-CEHC, α-carboxyethylhydroxychroman.