Compound 2 was obtained as an optically active, brown semisolid that was detected on TLC plates by the Mattocks- Molyneux reagent and was recognized as a retronecine/ heliotridine N-oxide.25 The necine unit was identified as heliotridine as in 1. The remaining signals in the 1H and 13C NMR spectra were reminiscent of two viridifloryl moieties, esterified at O-7 and O-9 as in the PA viridinatine.27 Two isopropyl groups (H3-6′/H-5′/H3-7′ and H3-13′/H-12′/H3-14′ fragments) and two 1-hydroxyethyl groups (H-3′/H3-4′ and H- 10′/H3-11′ fragments) were indeed recognized via COSY. The carbonyl carbons at δC 176.1 and 176.6 were attributed to C-8′ and C-1′, respectively, based on HMBC correlations of C-8′ to H-7, H-10′, and H-12′ and of C-1′ to H-9 and H-5′. In addition, peaks at δC 85.9 and 86.2 (missing from the DEPT spectrum) suggested the presence of two oxygenated quaternary carbon atoms. HMQC 13C/1H matching along with 13C/1H HMBC interactions observed among the aforementioned necyl signals (see Table 2) established their connectivity. The structural formula inferred for 2 corresponds to the molecular formula C22H37NO9 with a molecular mass of 459.5, as confirmed by the m/z 460.5388 of the [M + H]+ ion, obtained by HRESIMS. For the sake of comparison, part of 2 was reduced in an acidic zinc suspension.19 The 1H NMR spectrum of the free PA was recorded in the same specified solvent (CDCl3 saturated in D2O) and was subsequently compared with that of viridinatine.27 Viridinatine was reported to have two (−)-viridifloryl moieties esterified at O-7 and O-9, and consequently the isopropyl and 1-hydroxyethyl methine pairs appeared in the 1H NMR spectrum as close overlapping signals.