dolastatin 10 [ NSC 376128,Deo-Dola 10,deo-dolastatin 10,isodolastatin 10 ] from mollusk Dolabella auricularia; contains four amino acids, dolavaline, dolaisoleucine, dolaproine, valine and the primary amine dolaphenine; deo-dolastatin 10 is a new dolastatin 10 chiral derivat