Euxylophora parensis Hub. (Rutaceae), a Brazilian plant known as "tguP$o Amarello", was studied. Alumina chromatography of the methanolic extract of its bark isolated three new optically inactive alkaloids: euxylophorine (I, C₂₁H₁₉N₃O₃, 0.g% yield), orange-red needles from anhydrous benzene (m.p. 227-230°C); euxylophoricine A (II, C₂₀H₁₇N₃O₃, 0.0g% yield), colourless needles from chloroform-methanol (m.p. 235-238°C); and euxylophoricine B (III, C₂₀H₁₅N₃O₃, 0.01% yield), yellow prisms from chloroform-methanol (m.p. 310-312°C). Euxylophorine (I) showed IR (Nujol) peaks at 1670, 1656, 1618, 1603, 1545 cm⁻¹, UV (MeOH) maxima at 253 nm (log ε 4.44) and 402 nm (log ε 4.60), and NMR (C₅D₅N) signals including two symmetrical triplets (3.30 δ and 4.75 δ, -CH₂-CH₂-), two -OCH₃ singlets (3.90 δ and 3.96 δ), an :N-CH₃ singlet (5.23 δ), and six aromatic protons (7.2-8.2 δ). Hydrolysis of I with refluxing amyl alcoholic KOH produced 1-tetrahydronorharmanone (IV) and 6-methylaminoveratric acid (V), and its structure was confirmed by synthesis via condensation of IV with VII using POCl₃ in refluxing toluene. Euxylophoricine A (II) exhibited IR (Nujol) bands at 3300-3200, 1650, 1615, 1590 cm⁻¹, UV (MeOH) maxima at 255 nm (log ε 4.50), 337 nm (log ε 4.49), 253 nm (log ε 4.54), and 360 nm (log ε 4.43), and NMR (CDCl₃) signals for >C-CH₂-CH₂-N< (3.10 δ and 4.60 δ), two -OCH₃ (3.85 δ and 3.80 δ), a N-H proton, and six aromatic protons. Its structure was verified by hydrolysis to known compounds and synthesis (IV + VI). Euxylophoricine B (III) had IR (Nujol) absorption at 3350, 1656, 1634, 1600, 1575 cm⁻¹, UV (EtOH) maxima at 256 nm (log ε 4.54), 294 nm (log ε 4.40), 304 nm (log ε 4.53), 330 nm (log ε 4.37), 353 nm (log ε 4.27), 372 nm (log ε 4.45), and 392 nm (log ε 4.51), and NMR (CF₃COOH) data indicating a C₇-C₈ double bond (AM pattern at 8.20 δ and 9.13 δ, J=7 cps). Its structure was confirmed by formation from II via selenium dehydrogenation at 290°C. These alkaloids are the first examples of quinazolinocarboline alkaloids with substituents on the aromatic ring, which is biogenetically derived from an anthranilic acid unit.