(ˌ) ̷ ̷|kaptō+ noun
Etymology: mercapt- + purine
: an antimetabolite C 5 H 4 N 4 S that is a sulfur analogue of hypoxanthine and adenine, that interferes especially with the metabolism of purine bases and the biosynthesis of nucleic acids, and that is sometimes useful in the treatment of acute leukemia especially in children; 6-purine-thiol