Determination and variation of three active diterpenoids in Andrographis paniculata (Burm.f.) Nees. Pholphana N, Rangkadilok N, Thongnest S, Ruchirawat S, Ruchirawat M, Satayavivad J Phytochem Anal 2004; 15: 365-71.

Songthammawat, P.; Wangngae, S.; Matsumoto, K.; Duangkamol, C.; Ruchirawat, S.; Ploypradith, P. Bio-Inspired Diastereoconvergent Synthesis of the Tricyclic Core of Palodesangrens via Diels-Alder Reaction, LiAlH4-Mediated Isomerization, and Acid-Mediated Cyclization. J. Org. Chem. 2018, 83, 5225–5241.

Bensulong, S.; Boonsombat, J.; Ruchirawat, S. DBU-mediated Regioselective Intramolecular Cyclization/Dehydration of ortho-Diketo Phenoxyethers: A Synthesis of 2,3-Substituted γ-Benzopyranones. Tetrahedron 2013, 69, 9335–9348.