Singlet Biradical Versus Triplet Biradical/Zwitterion Characteristics in Isomers of C -C -C -C -C -Fused Pentacyclic Aromatic Hydrocarbons Revealed through Reactivity Patterns.

Among various polycyclic aromatic hydrocarbons, C -C -C -C -C fused pentacyclic aromatic hydrocarbons have the unique potential to adopt quinonoid, zwitterion, singlet, or triplet biradical electronic configurations. Two such hybrid structures between pentacene and azulene were synthesized and their ground state electronic configurations were deduced from the reactivity patterns they exhibit respectively. Compound 6, where the radicaloid carbons are linked through a para-phenylene, forms a head-to-head dimer like a singlet biradical.

[Effect of asarinin on the acute heart transplantation rejection and the expression of adhesion molecule].

Objective: To test the effect of asarinin, the extract of Herba Asari, on the acute heart transplantation rejection and the expression of adhesion molecule.

Method: Asarinin was extracted from herba asari. 64 SD rats undergone heart transplantation were divided into four groups: group A (control group), group B (Cyclosporine A treated), group C (Asarinin treated), and group D (1/2 CsA and 1/2 Asarinin).