Phomopsterones A and B, two functionalized ergostane-type steroids from the endophytic fungus Phomopsis sp. TJ507A - Hu, Z; Wu, Y; Xie, S; Sun, W; Guo, Y; Li, X N; Liu, J; Li, H; Wang, J; Luo, Z; Xue, Y (Org Lett, 2016)