methyl 2-((2R,4R)-2-tert-butyl-4-(4-methylpentyl)-5-oxo-1,3-dioxolan-4-yl)acetate

(R)-4-oxo-2-propyloxetane-2-carboxylic acid

(R)-benzyl 2-allyl-4-oxooxetane-2-carboxylate

dibenzyl 2,2'-((E)-but-2-ene-1,4-diyl)(2R,2'R)-bis(4-oxooxetane-2-carboxylate)

(1S,3aR,14bS)-2-methoxy-1,5,6,8,9,14b-hexahydro-4H-[1,3]dioxolo[4',5':4,5]benzo[1,2-d]cyclopenta[b]pyrrolo[1,2-a]azepin-1-yl (R)-4-oxo-2-propyloxetane-2-carboxylate