Table 1.

Structures of acyloxy derivatives 7a–m.

Compound Number	R1	R2	Compound Number	R1	R2
7a		H	7h		H
7b		H	7i		H
7c			7j		H
7d			7k		H
7e		H	7l		H
7f		H	7m		H
7g		H