trans-1-Phenyl-2-buten-1-one (CAS NO.35845-66-0) is also named as (2E)-1-Phenylbut-2-en-1-one ; 2-Buten-1-one, 1-phenyl- ; 2-Buten-1-one, 1-phenyl-, (2E)- ; Crotonophenone ; 1-Phenyl-but-2-en-1-one .