N-Cyclopentyl-N,N-dimethyl-cyclopentanaminium Hydroxide is an analog of N-Cyclohexyl-N,N-dimethyl-cyclohexanaminium Hydroxide (C987470) which is an organic structure-directing agent used in prepareation of intergrown β-zeolite SU-78A and SU-78B polymorphs with interconnected 12-ring channels.