8-O-4′ Neolignans from the fruits of Leonurus japonicus 
PENG Fang, XIONG Liang, HE Yu-lin, LIU Fei, PENG Cheng
NATURAL PRODUCT RESEARCH AND DEVELOPMENT . 2021, (8): 1320 -1325 .  DOI: 10.16333/j.1001-6880.2021.8.007