A compound, or a pharmaceutically acceptable salt or isomer thereof, of Formula I: wherein R is hydrogen, alkyl, substituted alkyl, alkenyl, or substituted alkenyl; R1 is hydrogen, alkoxy, or substituted alkoxy; R2 is hydrogen, alkyl, or substituted alkyl; and R3 is hydrogen, alkyl, or substituted alkyl.
化合物,或其药用可接受的盐或异构体,其
化学式为I:其中R为氢、烷基、取代烷基、烯基或取代烯基;R1为氢、烷氧基或取代烷氧基;R2为氢、烷基或取代烷基;R3为氢、烷基或取代烷基。