Synthesis and Molecular Structure of 1α-Hydroxy-13-Isopropyl-7,10A-Dimethyl-4-Oxooctadecahydro-4B,12-Methanochryseno[1,12-BC]Furan-7-Carboxylic Acid and Methyl 1β-Acetoxy-13-Acetyl-7,10A-Dimethyl-4-Oxohexadecahydro-1H-4B,12-Ethenochrysene-7-Carboxylate

New oxy-functionalized derivatives are synthesized by ozone oxidation of 1β,13- epoxydihydroquinopimaric acid and methyl ether of 1β-hydroxydihydroquinopimaric acid. Their molecular and crystal structures are determined by the single crystal X-ray diffraction analysis. 1α-Hydroxy-13-isopropyl-7,10a-dimethyl-4-oxooctadecahydro-4b,12-methanochryseno[1,12-bc]furan-7-carboxylic acid (II) is represented by crystalline hydrate of the monoclinic crystal system with the P21 space group, a = 12.3886(6) Å, b = 6.9442(3) Å, c = 13.7037(6) Å, β = 93.290(2)°. The presence of water molecules leads to the formation of a 2D network of hydrogen bonds making molecular layers parallel to (a, b). Crystals of methyl 1β-acetoxy-13-acetyl-7,10a-dimethyl-4-oxohexadecahydro-1H-4b,12-ethenochrysene-7-carboxylate (IV) are orthorhombic, space group P212121, a = 8.3760(3) Å, b = 16.2470(5) Å, c = 18.5603(6) Å.