What is the structure of trans-cinnamic acid, urea, naphthalene, anthracene, benzoic acid, benzophenone, p-bromo acetonilide, cholesterol, 4-clorobenzoic acid, cinnamic acid, 4-methoxy benzoic acid, 1-naphthol, 3-nitroaniline, 4-nitrophenol, 3-nitrobenzoic acid, salicylic acid, 0-toluic acid and p-toluic acid?