Cyclic form (A) Schiff base form (B)
Bond angles (o) Dihedral angles (o) Bond angles (o) Dihedral angles (o)
H29-C15-C16 119.758 C17-N18-C19-C9 118.396 H32-S20-C19 110.219 N13-C14-C19-C18 179.992
H29-C15-C14 119.848 N18-C19-C9-C8 133.06 H31-C18-C19 121.254 N13-C14-C15-C16 179.965
C16- C15-C14 120.394 C2-C10-O11-H26 101.723 H31-C18-C17 117.264 C14-C19-S20-H32 72.327
H28-C14-C15 119.635 C13-C12-C17-N18 179.608 C19-C18-C17 121.482 C15-C14-N13-C12 179.713
H28-C14-C13 119.694 C19-N18-C17-C16 178.568 H30-C17-C18 120.731 C9-C12-N13-C14 179.955
C15-C14-C13 120.67     H30-C17-C16 120.43 C8-C9-C12-N13 179.933
H30-C16-C17 120.688     C18-C17-C16 118.839    
H30-C16-C15 120.399     H29-C16-C17 120.014    
C17-C16-C15 118.912     H29-C16-C15 120.512    
C12-C17-N18 115.06     C17-C16-C15 119.474    
C12-C17-C16 120.83     C14-C19-C18 120.752    
N18-C17-C16 124.11     C14-C19-S20 127.244    
H27-C13-C14 119.24     C18-C19-S20 112.005    
H27-C13-C12 121.781     H28-C15-C16 116.104    
C14-C13-C12 118.979     H28-C15-C14 120.762    
C17-C12-C13 120.214     C16- C15-C14 123.134    
C17-C12-S20 114.008     C19-C14-C15 116.32    
C13-C12-S20 125.777     C19-C14-N13 132.385    
C12-S20-C19 97.185     C15-C14-N13 111.295    
H31-N18-C17 122.202     C14-N13-C12 131.33    
H31-N18-C19 123.005     H27-C12-N13 117.554    
C17-N18-C19 114.764     H27-C12-C9 116.044    
H32-C19-S20 109.889     N13-C12-C9 126.402    
H32-C19-N18 107.338     H26-O11-C10 109.471    
H32-C19-C9 113.911            
S20-C19-N18 98.942            
S20-C19-C9 113.811            
N18-C19-C9 111.791            
H26-O11-C10 109.399            
Table 2: Bond angles and dihydral angles for the cyclic form and Schiff base form.