| abstract |
(57) [Summary] (Corrected) [Constitution] The following formula [In the formula, B is adenine, guanine, thymine, uracil, cytosine, hypoxanthine, xanthine, 5-methylcytosine, 4-ethoxy-5-methyl-2-oxopyrimidine, 4-isopropoxy-5-methyl-2. -Oxopyrimidine or 5-methyl-2-oxopyrimidine, R 1 and R 2 are the same or different, and And each is a hydroxy group, or hydrogen, or together represents a bond, R 3 is n is 0, 1 or 3] and 4′-methylnucleoside derivatives which are pharmaceutically acceptable esters, ethers and salts thereof. [Effect] The above compounds have potential as antiviral agents, Further antitumor activity is expected. |