| Nomenclature | GPR18 | GPR55 | GPR119 |
| HGNC, UniProt | GPR18, Q14330 | GPR55, Q9Y2T6 | GPR119, Q8TDV5 |
| Potency order of endogenous ligands | – | – | N‐oleoylethanolamide, N‐palmitoylethanolamine>SEA (anandamide is ineffective) [1520] |
| Endogenous agonists | N‐arachidonoylglycine [1026] | lysophosphatidylinositol [773, 1502, 1854], 2‐arachidonoylglycerolphosphoinositol [1504] | N‐oleoylethanolamide [354, 1520, 1854], N‐palmitoylethanolamine, SEA |
| Selective agonists | – | AM251 [773, 948, 1695] | AS1269574 [2190], PSN632408 [1520], PSN375963 [1520] |
| Selective antagonists | – | CID16020046 (pA2 7.3) [949] | – |
| Comments | The pairing of N‐arachidonoylglycine with GPR18 was not replicated in two studies based on arrestin assays [1854, 2182]. See [414] for discussion. | See reviews [414] and [1800]. | In addition to those shown above, further small molecule agonists have been reported [722]. |
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