Spirograterpene A, a Tetracyclic Spiro-Diterpene with a Fused 5/5/5/5 Ring System from the Deep-Sea-Derived Fungus <i>Penicillium granulatum</i> MCCC 3A00475Siwen Niu, Xian‐Wen Yang, Zuowang Fan et al.|Journal of Natural Products|2017Cited by 72