Reaction catalyzed by tryprostatin B synthase (2.5.1.106)

		+			=			+
	dimethylallyl diphosphate	+		brevianamide F	=		diphosphate	+		(5aS,6aR,11aR,13aS)-6a-(3-methylbut-2-en-1-yl)-2,3,6,6a,11,11a-hexahydro-1H-pyrrolo[1'',2'':4',5']pyrazino[1',2':1,5]pyrrolo[2,3-b]indole-5,13(5aH,13aH)-dione