[1] Univ Complutense Madrid, Grp Lactamas & Heterocidos Bioact, Dept Quim Organ 1, Unidad Asociada,CSIC,Fac Quim, E-28040 Madrid, Spain
[2] IQOG CSIC, Inst Quim Organ Gen, Madrid 28006, Spain
[3] Univ Complutense Madrid, Fac Quim, CAI Difracc Rayos X, E-28040 Madrid, Spain