Analytical methods for Challenge5 Sample: 10 microM in methanol/water (50:50) Instrument: LTQ Orbitap Velos (Thermofisher Scientific) Resolution: 30,000 Ion source: nano-ESI, positive ion mode Spray voltage: 2.2 kV Sample Introduction: Infusion at the flow rate 500 nanoL/min CID condition: 20 V Precision on m/z: 3 ppm or better Scan range: FTMS + p NSI Full MS [50.00-390.00] FTMS + p NSI Full MSMS 291.07@hcd20.00 [50.00-300.00]