[Optical rotatory dispersion of levorin and isolevorin]

Optical rotation dispersion of levorin A2 and isolevorin A2, macrocyclic heptaen antibiotics in the region of 260--320 nm due to the presence of ketogroups in the molecules of these antibiotics was studied. On the basis of the study of the optical rotation dispersion, diffusion properties and molecular models of the antibiotics it was supposed that levorin and isolevorin differed in the space configuration of the macrocycli lactone ring.