The present invention provides a compound of which active form is represented by a formula (A). and which can be injected into a joint cavity which is an affected part of disorders and can be accumulated in the joint cavity to exert the pharmacological effect thereof in a sustained manner, for the purpose of ameliorating cartilage disorders without developing any side effect. A compound according to the present invention, which is represented by a formula (I):
(wherein all of symbols are as defined in the description), is a compound that can achieve the above-mentioned purpose. This compound does not exhibit any side effect on the cardiovascular system even when the compound is administered in an effective amount for exhibiting a cartilage regeneration activity, and is therefore extremely useful as a safe and effective preventive and/or therapeutic agent for cartilage disorders. Since a suspension produced using this compound can be injected without requiring the incision of the affected part, it can reduce the burden on patients, and is extremely useful as a medicinal agent.
Design principles to tune the optical properties of 1,3,4-oxadiazole-containing molecules
作者:Onas Bolton、Jinsang Kim
DOI:10.1039/b616996a
日期:——
We have synthesized a series of oxadiazole compounds and ethynylene analogs. Our data reveal that the ring is both optically transparent in the visible range and fully conjugating while we have also discovered the presence of a non-radiative mechanism active in molecules containing common para-dialkoxy substituents adjacent to the oxadiazole ring(s). This structure leads to a greatly reduced quantum yield, in our example dropping from 95.0% to 48.0%. Through our thorough study we have revealed evidence that this is the result of a repulsive interaction between the oxadiazole and the adjacent alkoxy oxygen atom, which we believe prevents excited-state planarity. This quantum yield reduction is preventable through the design principles presented here.