Remdesivir N-21191237-80-5100 % similar Gs-4415241191237-69-066 % similar 2′,3′-O-Isopropylideneadenosine362-75-439 % similar Remdesivir1809249-37-339 % similar 7-Bromopyrrolo[2,1-F][1,2,4]triazin-4-amine937046-98-532 % similar 2′,3′-O-(1-Methylethylidene)inosine2140-11-630 % similar