| abstract |
PROBLEM TO BE SOLVED: To disclose a compound which can be used for producing a modified nucleic acid with respect to a nucleic acid containing a modification at the 5'end, 3'end, or 5'end and 3'end. Modified nucleic acids have improved expression, lower immunogenicity, and improved stability compared to unmodified nucleic acids. SOLUTION: A compound of formula I or a salt thereof. [Selection diagram] None |