González, A. G., Galindo, A., Afonso, M. M., Mansilla, H., Palenzuela, Rodriguez, M. A. G., & Martinez-Ripoll. (1988). The biomimetic synthesis of trans-(1β-h,5α-h)-guaianolides. Tetrahedron, 44(14), 4575-4584. https://doi.org/10.1016/S0040-4020(01)86160-3