Peruranolides A–D, four new withanolides with potential antibacterial and cytotoxic activity from Physalis peruviana L. oleh Qian-Ran Li, Hui-Jun Liang, Bai-Lin Li, Jie Yuan, Zhuo-Yi Ao, Yu-Wen Fan, Wei-Jie Zhang, Xin Lian, Jia-Yan Chen, Jian-Zhong Wang, Jie-Wei Wu