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Theranostics is a new approach to cancer treatment based on using drugs which can provide both the diagnosis and the therapy. The effectiveness of the widely used method of photodynamic therapy (PDT) could be significantly improved by using theranostic grugs for pleminarary visualization of the tumor in the body, as well as monitoring the dynamics of treatment.In this work we propose the synthesis, photophysical and biological studying of theranоstics for PDT combining covalently bonded functional fragments: photosensitizer (bacteriochlorin) and fluorophore (naphthalimide), which could be excited by different wavelengths to serve therapy or fluorescent diagnostics