Patent ID: 8921309

Claim:
A compound selected from compounds of the following formula, and pharmaceutically acceptable salts thereof: wherein: —R 1 is independently —OH or —NH 2 and wherein: —R 2 is —R B wherein: —R B is independently R B4 —R B3 -L B2 -R B2 -L B1 -R B1 —C(O)— wherein: —R B1 — is independently —R BP — or —R BN —, and wherein: each of —R B2 —, and —R B3 — is independently —R BS —, —R BP —, —R BN — or —R BH —, and wherein: at least one of —R B2 — and —R B3 — is independently —R BH — wherein: each —R BP —, if present, is independently phenylene, and is optionally substituted and wherein: each —R BN —, if present, is independently naphthylene, and is optionally substituted and wherein: each —R BH — is independently aromatic or saturated or unsaturated non-aromatic C 4-14 heterocyclylene, and is optionally substituted and wherein: each —R BS —, if present, is independently a single bond and wherein: each of -L B1 - and -L B2 - is independently -L S -, -L BB - or -L BO - wherein: each -L S -, if present, is independently a single bond and wherein: each -L BB -, if present, is independently saturated aliphatic C 1-4 alkylene, and is optionally substituted and wherein: each -L BO -, if present, is independently saturated aliphatic C 1-4 alkoxylene, and is optionally substituted and wherein: —R B4 is independently —H, —R B4A , —R B4AA or R B4O wherein: —R B4A , if present, is independently saturated or unsaturated aliphatic or alicyclic C 1-10 alkyl, and is optionally substituted and wherein: —R B4AA , if present, is independently C 6-10 aryl-C 1-6 alkyl, and is optionally substituted and wherein: —R B4O , if present, is independently —R B4O1 or R B4O2 wherein: —R B4O1 , if present, is independently saturated or unsaturated aliphatic or alicyclic C 1-10 alkoxy, and is optionally substituted and wherein: —R B4O2 , if present, is independently C 6-10 aryloxy, and is optionally substituted.