(5,11,17,23-Tetra-tert-butyl-26,28-dihydroxycalix[4]arene-25,27-dioxy)diacetic acid N,N-dimethylformamide trisolvate.

The title compound, C48H60O8.3C3H7NO, is a derivative of calix[4]arene in the cone conformation, modified with distal carboxylic acid functional groups at the lower rim. A clathrate dimethylformamide (DMF) molecule is located within the calix[4]arene cone, and two DMF solvate molecules participate in hydrogen bonding with the carboxylic acid groups. Intramolecular hydrogen bonds are also formed between the OH groups and the adjacent ether groups in the partially substituted calix[4]arene.