Butlerin D (4) (3',4,4",5',6'-pentamethoxy[1,1':4',1"-terphenyl]-2'-yl acetate), butlerin E (5) (3',4,4'6'-tetramethoxy[1,1':4',1"-terphenyl]-2',5'-diyl diacetate ) and butlerin F (6) (3',4,4",5'- tetramethoxy [1,1":4',1"-terphenyl]-2',6'-diyl diacetate ) have been synthesized and shown to co-occur with usnic acid, butlerin A (1), butlerin B (2) and butlerin C (3) in the lichen Relicina connivens.
Butlerin D(4)(3',4,4",5',6'-五甲氧基[1,1':4',1"-二苯基]-2'-乙酸酯),butlerin E(5)(3',4,4'6'-四甲氧基[1,1':4',1"-二苯基]-2',5'-二乙酸酯)和butlerin F(6)(3',4,4",5'-四甲氧基[1,1":4',1"-二苯基]-2',6'-二乙酸酯)已被合成,并显示与地衣Relicina connivens中的usnic酸、butlerin A(1)、butlerin B(2)和butlerin C(3)共存。