Create a SL-I Structure

example structure
Acyl group R1: Acyl group R2
Acyl group R3 Acyl group R4

Create a SL-II Structure

example structure
Acyl group R1: Acyl group R2
Acyl group R3 Acyl group R4

Create a SL-II' Structure

example structure
Acyl group R1: Acyl group R2
Acyl group R3 Acyl group R4

Create a SL-III Structure

example structure
Acyl group R1: Acyl group R2
Acyl group R3