Identifier types that can be used for a physical entity search:

3dmet
amaze
aracyc
beilstein
bind
biogrid
brenda-compound
cas
ccsd
chebi
chembl
chemspider
cyc2008
cygd
dip
ec
ecocyc
embl
emdb
ensembl
ensemblgenomes
entrez
entrez-gene
enzyme-db
genbank
genbank indentifier
genbank_nucl_gi
glytoucan
go
het
hmdb metabolite
imex
intact
intenz
interpro
jcggdb
kegg
knapsack
lipid_maps
lipidbank
lipidmaps
mdl
merck index
mim
mint
mips
ncbi-proteinid
nci
nikkaji
pdb
pdb-ccd
pdbe
pin
psi-mi
pubchem
pubchem-compound
pubchem-substance
pubmed
rcsb pdb
reactome
refseq
ricecyc
rnacentral
sgd
sgd-id
um-bbd-cpd
uniprot
wikipathways
wwpdb
yeastcyc
zinc
|chemspider|