Bond lengths (Å)
Cyclic form (A) Schiff base form (B)
C19-H32 1.113 S20-H32 1.346
N18-H31 1.047 N18-H31 1.104
C16-H30 1.102 C17-H30 1.103
C15-H29 1.103 C16-H29 1.103
C14-H28 1.103 C15-H28 1.106
C13-H27 1.104 C12-H27 1.093
O11-H26 0.97 O11-H26 0.97
C8-H25 1.103 C8-H25 1.104
C7-H24 1.103 C7-H24 1.103
C6-H23 1.102 C6-H23 1.102
C5-H22 1.102 C5-H22 1.102
C4-H21 1.103 C4-H21 1.103
C4-N3 1.264 C14-C19 1.354
C2-N3 1.269 C18-C19 1.347
C1-C2 1.347 C17-C18 1.34
C10-C2 1.35 C16-C17 1.338
C9-C10 1.351 C15-C16 1.341
C8-C9 1.345 C14-C15 1.354
C7-C8 1.34 C4-N3 1.264
C1-C7 1.342 C2-N3 1.269
C6-C1 1.344 C1-C2 1.347
C5-C6 1.34 C10-C2 1.351
C4-C5 1.34 C9-C10 1.353
C12-C17 1.346 C8-C9 1.348
N18-C17 1.268 C7-C8 1.34
C16-C17 1.34 C1-C7 1.341
C15-C16 1.343 C6-C1 1.344
C14-C15 1.344 C5-C6 1.34
C13-C14 1.344 C4-C5 1.34
C12-C13 1.342 C19-S20 1.832
S20-C12 1.474 C14-N13 1.273
C19-S20 1.792 C12-N13 1.264
N18-C19 1.473 C9-C12 1.353
C19-C9 1.514    
Table 1: Bond lengths for the cyclic form and Schiff base form.