The contest data were acquired on a Waters 2695 solvent delivery system integrated with a Waters SYNAPT quadrupole/time-of flight (QTOF) mass spectrometer operating in positive ion electrospray mode.  Reversed phase separation was carried out using a Waters XBridge 2.0 x 50mm C18 column (2.5 µm particle size) and a mobile phase consisting of  water + 0.1% formic acid as solvent A and acetonitrile as solvent B. A linear gradient from 60-100%B operating at a flow rate of 0.20mL/min over 10 minutes was applied. Under these conditions the compound eluted as two peaks at the retention times of 4.0 and 4.2 min. Mass spectrometric data for both of these peaks were identical. The expected mass accuracy of the instrument is <5ppm in MS mode or < 10ppm (or < 1.8mDa) in MS/MS mode. MS/MS data were acquired using CID with argon as a collision gas, with a precursor selection width of +/ 1.5 Da, a precursor m/z of 523 and a collision energy of 25eV.