Structures of terpendoles and other known compounds: Terpendole N (1), terpendole O (2), terpendole P (3), voluhemin A (4), voluhemin B (5), NK12838 (6), terpendole C (7), terpendole D (8), terpendole L (9), tolypocladin A (10), terpendole J (11), and sespendole (12).