| abstract |
The present invention relates to a compound of formula (1): wherein R1 to R8 can be the same or independently different from each other, can be selected from the group consisting of hydrogen and the radical (CH2) kX where k is an integer from 0 to 20, and where X is an organic radical containing a) at least one neutral, protonizable nitrogen atom and / or b) at least one positively charged nitrogen atom, provided that at least 1 radical R1 to R8 is not hydrogen, the invention is subject to the production and use of this compound. is about. |