The IS (batch no. FN020411-01, 99.9% purity) was purchased from Cerilliant Corparation (Texas, USA). The structures of STS and the IS are shown in Fig. 1. Methanol and acetonitrile of HPLC grade were obtained from DIKMA Company, (USA). Formic acid and ammonium formate of HPLC grade were purchased from CNW Company (Germany). Other chemicals were all of analytical grade. Ultra-pure water was prepared by a Millipore Simplicity UV system (Millipore, Bedford, MA,
USA).
The IS (batch no. FN020411-01, 99.9% purity) was purchased from Cerilliant Corparation (Texas, USA). The structures of STS and the IS are shown in Fig. 1. Methanol and acetonitrile of HPLC grade were obtained from DIKMA Company, (USA). Formic acid and ammonium formate of HPLC grade were purchased from CNW Company (Germany). Other chemicals were all of analytical grade. Ultra-pure water was prepared by a Millipore Simplicity UV system (Millipore, Bedford, MA,USA).
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