SYNTHESIS AND PHOTOCHEMICAL STUDY OF THIAZOLIDINE DERIVATIVES OF CYMANTRENE AND THE CORRESPONDING DICARBONYL CHELATES Article Telegina L.N., Kelbysheva E.S., Strelkova T.V., Ezernitskaya M.G., Smol'yakov A.F., Borisov Y.A., Loim N.M. ChemistrySelect. Wiley-Blackwell. Vol. 4. 2019. P. 1613-1617