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