(4aS,7R,7aS)-tetrahydro-4a-(hydroxymethyl)-2,2,7-trimethyl[1,3]dioxino[5,4-b]pyrrol-6(4H)-one

(3R,4S)-4-hydroxy-3,8,8-trimethyl-7,9-dioxa-1-azaspiro[4.5]decan-2-one

(4aS,7R,7aS)-2,2,7-trimethyl-6-oxotetrahydro-[1,3]dioxino[5,4-b]pyrrole-4a(4H)-carboxylic acid

methyl (4aS,7R,7aS)-hexahydro-2,2,7-trimethyl-6-oxo-[1,3]dioxino[5,4-b]pyrrole-4a-carboxylate

(4aR,7R,7aS,1'S)-tetrahydro-4a-(1'-hydroxy-2'-methylpropyl)-2,2,7-trimethyl[1,3]dioxino[5,4-b]pyrrol-6(4H)-one