[1] Univ London, Sch Pharm, Canc Res UK Biomol Struct Grp, London WC1N 1AX, England
[2] Univ Roma La Sapienza, Dipartimento Chim, I-00185 Rome, Italy
[3] Univ Roma La Sapienza, Dipartimento Genet & Biol Mol, I-00185 Rome, Italy
[4] Univ Roma La Sapienza, Scuola Specializzaz Sostanze Organ Nat Luigi Pani, I-00185 Rome, Italy
[5] Univ Roma La Sapienza, CNR, Ist Biol & Patol Mol, I-00185 Rome, Italy
[6] Univ Roma La Sapienza, CNR, Ist Chim Biomol, I-00185 Rome, Italy