Answer: inosine

AnswerCrossword Clue
inosinea nucleoside C10H12N4O5 that is composed of hypoxanthine and ribose, that in the form of its monophosphate is a biosynthetic precursor of both AMP and its guanosine analog, and that binds to adenine, cytosine, or uracil especially in some transfer RNAs compare poly ic
inosinea compound of hypoxanthine and ribose