| 摘要 |
The invention relates to compounds of the formula (1) A1 - B - R - B - A2 wherein A1 and A2 each denotes a residue of a polycyclic auinone, of which one must be vattable, B denotes a five-membered or six-membered heterocyclic ring which contains at least one ring nitrogen atom, and R denotes the residue of a polyfunctional hydroxy or mercapto compound which is bound through two of its oxygen or sulphur atoms to a carbon atom of the residue B. |
