| 摘要 |
<p>The invention provides coumarin or coumarinimide compounds, free from carboxylic and sulphonic acid groups, having at the 3-position a group of formula X, in which R3 signifies a hydrogen atom, an acyl radical or an unsubstituted or substituted alkyl or phenyl radical, EITHER R4 and R5 each signify a hydrogen atom, acyl radical, a substituted or unsubstituted alkyl or phenyl radical or a heterocyclic radical, OR R4 and R5 together with the nitrogen atom to which they are attached, form a heterocyclic ring.</p> |
