The corresponding nucleoside (the terminology of which is a constant source of confusion for neophytes and some experts) is called inosine. Inosinate (IMP) is the key intermediate in the synthesis of AMP and GMP. Xanthine is a breakdown product of purines. The deoxyribonucleosides and deoxyribonucleotides are named by including the deoxy prefix before the corresponding ribonucleoside or ribonucleotide: for example, deoxyadenosine (dA), deoxyadenylate (dAMP). The deoxy prefix is abbreviated as "d.