Figure 2.

Key images for the structural elucidation of 1, 2, and 6–11. (A) Key ¹H–¹H COSY (bold in black), HMBC correlations (arrow in blue), and planar structures of compounds 1 and 8–10. (B) Primary ROESY correlations of compounds 1 and 9, and primary NOESY correlations of compound 10. (C) X-Ray structures of compounds 1 and 2. (D) Experimental ECD spectra of compounds 1, 6, 7, and 9–11 (CH₃OH), and calculated ECD spectra of compounds 9 and 10 (CH₃OH).