POLYMER DERIVATIVES AND POLYETHYLENE GLYCOL DERIVATIVES FOR USE IN THE MANUFACTURE OF THERAPEUTIC AND DIAGNOSTIC AGENTS AND IMAGING AGENTS FOR DIAGNOSTIC PURPOSES; POLYMER DERIVATIVES AND POLYETHYLENE GLYCOL DERIVATIVES FOR USE IN THE MANUFACTURE OF PHARMACEUTICAL, VETERINARY AND COSMETIC PREPARATIONS; POLYMER BEADS FOR USE IN MANUFACTURING; POLYALKYLENE GLYCOLS FOR USE IN THE MANUFACTURE OF PHARMACEUTICAL, VETERINARY AND COSMETIC PREPARATIONS AND SUBSTANCES, THERAPEUTIC AND DIAGNOSTIC AGENTS...