Wikipedia: JWH-073 is an analgesic chemical from the naphthoylindole family, which acts as a partial agonist at both the CB1 and CB2 cannabinoid receptors. It is somewhat selective for the CB2 subtype, with affinity at this subtype approximately 5x the affinity at CB1.[2]The abbreviation JWH stands for John W. Huffman, one of the inventors of the compound.
Ingestion of JWH-073 produces effects similar to THC. JWH-073 is one of the cannabinoids that has been isolated from "legal" smokes like Spice.