This document relates to an abiraterone derivative, 2-(((3S,8R,9S,10R,13S,14S)-10,13-dimethyl-17-(pyridin-3-yl)-2,3,4,7,8,9,10,11,12,13,14,15-dodecahydro-1H-cyclopenta[a]phenanthren-3-yl)oxy)-2-oxoacetic acid (ABOA). This document also relates to compositions comprising a non-covalently bound complex comprising ABOA and human serum albumin, wherein the ABOA and the human serum albumin in the composition have a ratio of weight from about 1:1 to about 1:2000. This document also relates to compositions comprising ABOA and human serum albumin, wherein the ABOA and the human serum albumin in the composition have a ratio of weight from about 1:1 to about 1:2000. This document also relates to compositions consisting essentially of ABOA and human serum albumin, wherein the ABOA and the human serum albumin in the composition have a ratio of weight from about 1:1 to about 1:2000.
