Compound 2

(3R,4R)-4,5-dihydroxy-3-methoxy-4-(4-methoxyphenyl)-6-((E)-2-(2,4,4-trimethyl-3-oxabicyclo[3.1.0]hexan-2-yl)vinyl)-3,4-dihydroquinolin-2(1H)-one

From: Enzyme-catalyzed cationic epoxide rearrangements in quinolone alkaloid biosynthesis