The application provides application of polycyclic polyisoprenyl acyl
phloroglucinol compounds (PPAP) of two different skeleton types in preparation of medicines for relieving / treating neurodegenerative diseases. The application belongs to the technical field of medicines. The hyphenrone A provided by the application is a 1,9-cracked polycyclic polyisoprenyl acyl
phloroglucinol compound, and the hyphenrone L is a polycyclic polyisoprenyl acyl
phloroglucinol compound with a complex ring
system formed by intramolecular [4+2] cyclization of a monocyclic polyisoprenyl acyl phloroglucinol compound. The compound hyphenrone A and the compound hyphenrone L both have the activity of enhancing the
voltage-gated T-type
calcium channel current, and can be used for preparing medicines for treating neurodegenerative diseases, and in particular, can be used for preparing medicines for relieving and / or treating diseases such as
spinocerebellar ataxia, Alzheimer's
disease and mental retardation syndrome, and have the clinical application value.