abstract |
Antitumoural compounds of general formula (I); wherein Ar is an heterocyclic group of formula (a) and R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , n and the dotted line take permitted meanings can be obtained from a tunicate of the family Polyclinidae, genus Aplidium , species cyaneum , and the invention further provides derivatives thereof. |