000.0° in MeOH). In the ESIMS spectra of **0** and **0**, the same quasi-molecular ion peaks (**0** and **0**: \[M+Na\]^+^) were observed at *m*/*z* 000. The molecular formulas (**0** and **0**: C~00~H~00~O~0~S~0~) were determined on the basis of HRESIMS peaks at \[**0**: *m/z* 000.0000, **0**: *m/z* 000.0000 (calcd. 000.0000)\]