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Amalija Golobicˇ, and Professor Anton Meden for the
X-ray structural determinations. The financial support
from the Ministry of Education, Science, and Sport (pro-
ject numbers: P0-0502-0103, P1-0179, and J1-6689-0103-
04), Slovenia, Krka d.d., and Lek d.d., Slovenia, is grate-
fully acknowledged. Many thanks are due to Alexander
von Humboldt-Stiftung, Germany, for the donation of a
medium pressure liquid chromatograph.
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