5-Chloro-2,3-dihydro-1-(piperi

L-Mimosine (-(3-Hydroxy-4-Pyridone-1-yl)-L-Alanine)

matter in the seed has limited its use as a livestock feed since mimosine and its degradation products 3-hydroxy-4-(1H )-pyridone (3,4-DHP) and 2,3-dihydroxypyridine (2,3-DHP) have been known to be toxic to many species (Fig. 1) . Ingestion of mimosine

Two‐Step, One‐Pot Synthesis of Inosine, Guanosine, and 2′‐Deoxyguanosine O6‐Ethers via Intermediate O6‐(Benzotriazol‐1‐yl) Derivatives

for the etherification at the O 6 ?position of silyl?protected inosine, guanosine, and 2??deoxyguanosine is described. Typically, a THF solution of the silylated nucleoside is treated with 1H ?benzotriazol?1?yloxy?tris(dimethylamino)phosphonium hexafluorophosphate (BOP

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）。