“…19 Calixarenes with dansyl groups have been used for sensing various guest analytes [20][21][22] and pesticides, such as dalapon, glyphosate, methiocarb, benomyl and carbendazim, which can be detected spectrouorometrically. [23][24][25][26] In particular, oxacalix [4]arenes (OC), which are heteracalixarenes in which the methylene bridge is replaced by oxygen, hold additional recognition features. Oxacalix [4]arenes can easily bind with anions, cations and neutral guests due to the capability of H-bonding and the possession of a constitutional hollow cavity to form inclusion complexes.…”