合成的一系列红紫素-18酰亚胺衍生物具有长波长的紫外吸收。
A series of novel purpurin-18 imide derivatives with long absorption wavelength were synthesized through Wittig reaction of methyl pheophorbide-a.
在碱性条件下，通过空气氧化将E环转变为环己二羧酸酐形成红紫素18甲酯衍生物；
In basic condition E ring was converted into the cyclohexanedicarboxylic anhydride to form purpurin 18 derivatives by the air oxidation.
其中一项研究观察了紫锥菊跟维生素c(另外一种抗感冒药)配伍的效果。该研究发现二者合用降低感冒发病率达86%。
One of the studies looked at echinacea used with vitamin c, another common cold remedy, and that one showed the two together reduced the number of colds by 86%.
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