Anticancer compounds

A compound of Formula IV:

• R6 and R7 each independently is selected from —H, or alkoxy;
• R is selected from:
• R13 is —OH;
• R14 is selected from alkoxy, or —OH;
• R15 is selected from alkoxy, or —OH;
• R16 is —H;
• R17 is alkyl;
• R11 and R12 each independently is selected from —H, substituted or unsubstituted 5-membered lactone ring, —C(O)O-alkyl;
• when R is
• R11 and R12 are not together as lactone;
• and
• when R13 is —OH and, R14 and R15 are -alkoxy;
• then R16 is —H;
• R6, R7, R11 and R12 are not —H.