The invention provides novel amino acids and peptides containing them which comprise a dihydropyridine ⇄pyridinium salt-type redox system and which provide site-specific and sustained delivery of pharmacologically active peptides to the brain. These new amino acids contain a redox system appended directly or via an alkylene bridge to the carbon atom adjacent to the carboxyl carbon and may be incorporated into a peptide chain at a variety of positions, including non-terminal positions.
本发明提供了包含
二氢吡啶⇄
吡啶鎓盐类氧化还原系统的新型
氨基酸和含有这些
氨基酸的肽,这些
氨基酸和肽可将具有药理活性的肽定点、持续地输送到大脑中。这些新型
氨基酸含有直接或通过烯桥附加到羧基碳邻近碳原子上的氧化还原系统,可在包括非末端位置在内的多个位置掺入肽链中。