4-amino-2,3-dihydro-1H-pyrazol

Synthesis of 3-Amino-l-CarboxymethyI-Benzodiazepine (BZA) Peptidomimetics

inhibitors of Ras famesyltransferase (FTase) (6 ,7 ). The central pair of amino acids in the CAAX tetrapeptide was replaced with the nonpeptide scaffold 3-methylamino-1-carboxymethyl-2,3-dihydro-5-phenyl-1H-1,4-benzodiazepin-2-one, (N -Me)BZA, shown below.

Preparation of Unnatural Amino Acids with Ammonia-Lyases and 2,3-Aminomutases

of unnatural amino acids. Besides the synthesis of various unnatural α-amino acids with the aid of phenylalanine ammonia-lyases (PALs) utilizing the 3,5-dihydro-5-methylidene-4H-imidazol-4-one (MIO) prosthetic groups, the biotransformations leading to various

毛撮 hair pencil

斑蝶科及夜蛾科昆虫的雄虫，尾端及胸部有一对毛束，打开成伞状，发散特殊的臭味。这样的毛束一般称为毛撮。斑蝶科雄虫在飞翔中与雌虫相遇时，将毛撮突出擦过雌虫的头部。雌虫感应后，便飞落地上，进行交尾。毛撮的分泌物是性外激素之一种，斑蝶科的Lycorca ceres ceres及 Danaus gilippus he-renice的鉴定结果是 2， 3-二氢化 -7-甲基 -1H吡咯烷嗪 -1-酮（ 2， 3-dihydro-7-methyl-1H-pyrrolizin-1-one）。