AIDS112620 Acteoside isomer Isoacteoside .beta.-D-Glucopyranoside, 2-(3,4-dihydroxyphenyl)ethyl 3-O-(6-deoxy-.alpha.-L-mannopyranosyl)-6-O-[(2E)-3-(3,4-dihydroxyphenyl)-1-oxo-2-propenyl]- AIDS-112620