In addition, the indole core is substituted at R3 which has a carbonyl team and that is also bonded to a napthalene moeity. Napthalene is a bicyclic composition of two fused benzene rings. This carbonyl bridge of JWH-018 classifies it for a ketone. JWH-018 is undoubtedly an analog of THJ-018, https://am67837036.techionblog.com/32985700/details-fiction-and-am-2201