• Acharya, C., et al.: Mol. Pharm., 5, 818 (2002)
• Amborabe, B., et al.: Plant Physiol. Biochem., 40, 1051 (2002)
• Exists in equilibrium with 3-hydroxy-3-methylphthalide, precursor of 3-methylenephthalidyl (MPID) derivatives of amino acids. Deprotection can be effected with hydrazine hydrate: Synthesis, 43 (1977).