Do you know what 'the latter' means The idea of marketing secure areas is faintly bizarre. ConcentrationCampsʀUs ???
PS Sorry for not recognizing the problem. It's a particular use of 'compounds' that isn't the chemical sort; it's an 'unidentified mixture of stuff', often used in Victorian/Edwardian marketing. (The Scaffold song Lily the Pink satirized this sort of panacea.)
Student or Learner