Novel Squaramides and Squaramates Containing a Five-Membered Heterocyclic Ring: Synthesis, Structure, and Cytotoxicity. - Tirolski, Georgi; Vasilev, Boris; Atanasova, Mariyana; Momekov, Georgi; Sbirkova-Dimitrova, Hristina; Bakalova, Adriana; Cherneva, Emiliya (International Journal of Molecular Sciences, 2026)