uncaramelized grape must which is: obtained by partial dehydration of grape must carried out by any authorized method other than by direct heat in such a way that the figure indicated by a refractometer (used in accordance with the method prescribed in the Annex III to Regulation (EEC) No 543/86 at a temperature of 20 °C, is not less than 50,9 %, - is derived exclusively from wine varieties referred to in Article 69, - produced within the Community, and - obtained from grape must having at least the minimum natural alcoholic strength by volume laid down for the wine-growing zone in which the grapes were harvested