| abstract |
A compound having the formula:n wherein R 1 is naiogen or a substituted or unsubstituted hydrocarbon group; R 2 , R 6 and R 7 , which may be the same or different, each represents hydrogen or a substituted or unsubstituted hydrocarbon group, or R 6 and R 7 take together may represent a hetero group having one or more hetero atoms; R 3 and R 4 which may be the same or different each represents a substituted or unsubstituted hydrocarbon group; or R 3 and R 4 taken together may represent an alkylene group or a hetero group having one or more hetero atoms and R s is hydrogen, a substituted or unsubstituted hydrocarbon group, halogen or a free or protected hydroxy group, or a pharmaceutically acceptable salt thereof. The compounds have antiaggregating properties and some of them also have antitumor and antimetastatic activity. |