Also, the indole core is substituted at R3 by using a carbonyl team that is also bonded into a napthalene moeity. Napthalene is often a bicyclic structure of two fused benzene rings. This carbonyl bridge of JWH-018 classifies it as being a ketone. JWH-018 is undoubtedly an analog of THJ-018, https://spicesilver41626.blogoxo.com/33112099/the-smart-trick-of-5f-adbica-that-no-one-is-discussing