mono-TMS-N2-acetyl-O6-diphenylcarbamoylguanine

3-O-benzyl-1,2-di-O-acetyl-5-O-(methylsulfonyl)-4-C-(methylsulfonyloxymethyl)-α,β-L-threo-pentofuranose

3-甲基-2-丁酮

频哪酮

二乙基酮