Citation: D\'iaz-Moscoso, Alejandro; Hern\'andez-Alonso, Daniel; Escobar, Luis; Arroyave, Frank A.; Ballester, Pablo (2017). Stereoselective Synthesis of Lower and Upper Rim Functionalized Tetra-\a Isomers of Calix[4]pyrroles.. Organic letters, 19, pp. 226-229.