two,695.89; observed, 2,695.992 (intensity 100 ). The structure on the isomers was further identified based
two,695.89; observed, 2,695.992 (intensity 100 ). The structure with the isomers was additional identified according to the J-couplings on the protons, and also the g-COSY NMR spectra of cand a-FACD…