(4 Å)), dimethyl sulfoxide (DMSO, anhydrous, dried over molecular sieves (4 Å)), methanol (MeOH, HPLC grade), potassium carbonate (K2CO3, ACS grade), ammonium formate (NH4HCO2, ACS grade), ammonium bicarbonate (NH4HCO3, ACS grade) were purchased from Sigma-Aldrich (St Louis, USA...
(4 Å)), dimethyl sulfox- ide (DMSO, anhydrous, dried over molecular sieves (4 Å)), methanol (MeOH, HPLC grade), potassium carbonate (K2CO3, ACS grade), ammonium formate (NH4HCO2, ACS grade), ammonium bicarbonate (NH4HCO3, ACS grade) were purchased from Sigma- Aldrich (St Louis...