P450-Mediated Dual Cyclization Mechanisms for Pyrroloindoline Unit Formation in Bispyrrolidinoindoline Diketopiperazine Alkaloid Biosynthesis - Yeqing Du; Guangzheng Wei; Tai-Ping Zhou; Yuhan Dai; Wenya Tian; Mancheng Tang; Zixin Deng; Binju Wang; Xudong Qu (Journal of the American Chemical Society, 2025)