Patent ID: 7378421

Claim:
A compound of formula I wherein R 1 is —OH, or —OA, R 2 is H, —OH, —OA, phenoxy, —O—CO-A, —OSO 3 H, —OSO 3 A, —OSO 2 A, or Hal, R 3 is H, R 1 and R 2 together are alternatively methylenedioxy or ethylenedioxy, Het is chromen-2-onyl, benzothiazolyl, thienyl, pyridinyl, pyrimidinyl, pyrazinyl, indolyl, furyl, pyrrolyl, isoxazolyl, imidazolyl, thiazolyl, triazilyl, tetrazolyl, quinolyl or isoquinolyl, each of which is unsubstituted or mono- or disubstituted by Hal and/or A, and A is unbranched or branched alkyl having 1-6 carbon atoms, where 1-5 H atoms may be replaced by F, or a salt thereof.