. 2011 Feb 22;34(1):181–193. doi: 10.1007/s11357-011-9218-4

Table 5.

Urinary metabolites that are detected only at d14 (positive and negative ion modes)

RT	m/z	Identification
3.8	447.119	Cysteine paracetamol glucuronide^b
4.2	328.103	Paracetamol glucuronide^a
4.7	271.075	Cysteine paracetamol^a
5.1	152.063	Paracetamol^a
5.5	358.130	3-Methoxy-paracetamol glucuronide^b
5.5	281.125	Benzothiazine compound^b
5.9	248.031	Hydroxy-paracetamol sulfate^c
6.3	232.031	Paracetamol sulfate^a
6.6	449.045	Unknown^d
7.7	313.091	N-acetylcysteine paracetamol^a
9.3	198.063	C₉H₁₁NO^d₄

RT retention time, m/z mass-to-charge ratio

^aIdentified compounds (identification with chemical reference standards)

^bPutatively annotated compounds (e.g. without chemical reference standards, based upon physicochemical properties and/or spectral similarity with public/commercial spectral libraries)

^cPutatively characterized compound classes (e.g. based upon characteristic physicochemical properties of a chemical class of compounds, or by spectral similarity to known compounds of a chemical class)

^dUnknown compounds—although unidentified or unclassified these metabolites can still be differentiated and quantified based upon spectral data