The present invention relates to novel Fused Tetracycle Derivatives of Formula : and pharmaceutically acceptable salts thereof, wherein A, A\u2032, B, G, R1, U, V, W, W\u2032, X, X\u2032, Y and Y\u2032 are as defined herein. % of water, in which process the gas mixture is passed over a sulphur resistant hydrogenation catalyst in sulphidic form, at a space velocity of at least 2000 h1, in the presence of a reducing component, preferably at least partly consisting of hydrogen, in a molar ratio or reducing component to sulphur dioxide of more than 10 up to 100, at a temperature of 125 C. One region includes an overhead representation of an area and an interactive control overlaid onto the overhead representation.