“…At this time, a number of different carborane-containing amino acids have been synthesized and evaluated. 161,189,[296][297][298][313][314][315][316][317][318][319][320][321][322][323][324] Not all of these are classical R-amino acids. A very interesting amino acid structure has been prepared by Kahl and Kasar 190,325 involving o-, m-, and p-carboranes in which the amino and carboxyl functions are located on the different carbon atoms of the carborane nucleus.…”