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http://www.rcsb.org/pdb/search/smart.do?smartSearchSubtype_0=ChemSmilesQuery&smiles_0=NC%28%3D%5BNH2%2B%5D%29c1cc2cc%28%5BnH%5Dc2cc1Cl%29-c1cccc%28OC2CCCC2%29c1%5BO-%5D&searchType_0=Similar&similarity_0=0.8&polymericType_0=Any&smartComparator=and&target=Ligand

It has been permanently removed as part of our announced shutdown on December 9th, 2020.

See the Legacy API Shutdown December 9 announcement for further details.


Legacy APIs

If you are using one of the legacy API endpoints, you will need to migrate to the new json-based APIs.

The new APIs provide more comprehensive search and fetch capabilities, see Web Services Overview.

Documentation for the new services and migration guides are available:

Data API tutorial
Search API tutorial
Data API migration guide
Search API migration guide