SEARCH Articles Figures Tables Chemicals Derwent Databases Patent -. Derwent Derwent Access Derwent Chemical Reactions Derwent Drug File Derwent Estuary Derwent Information Service Derwent Information databases Derwent Selection database Derwent Standard Drug File Derwent Week Derwent World Drug Derwent World Patent Derwent abstract Derwent data base Derwent format Derwent fragmentation code Derwent subscriber Derwent world drug index Derwent world patents index Derwent, Inc Generic Structures Derwent Markush Structures Derwent Patent Information Derwent Database Searching Derwent Structures Derwent Structures Systems Derwent Structures Systems Derwent-DARC World Patents Index from Derwent