Structure based on ?

Ideal structure
Name: 4-ethyl-4-hydroxy-1,12-dihydro-4h-2-oxa-6,12a-diaza-dibenzo[b,h]fluorene-3,13-dione
Formula: C20 H16 N2 O4
Weight: 348.352
SMILES: "CC[C]1(O)C(=O)OCC2=C1C=C3N(Cc4cc5ccccc5nc34)C2=O"
Spacial conformation based on PDB ?.
Also present on 1t8i
RESIDUE   EHD     42
CONECT      O18    1 C14 
CONECT      C14    3 O18  C15  N12 
CONECT      C15    3 C14  C19  C16 
CONECT      C19    4 C15  O22  H191 H192
CONECT      O22    2 C19  C20 
CONECT      C20    3 O22  O23  C21 
CONECT      O23    1 C20 
CONECT      C16    3 C15  C17  C21 
CONECT      C17    3 C16  C13  H17 
CONECT      C21    4 C20  C16  O24  C25 
CONECT      O24    2 C21  H24 
CONECT      C25    4 C21  C31  H251 H252
CONECT      C31    4 C25  H311 H312 H313
CONECT      N12    3 C14  C11  C13 
CONECT      C11    4 N12  C8   H111 H112
CONECT      C8     3 C11  C7   C9  
CONECT      C7     3 C8   C6   H7  
CONECT      C6     3 C7   C5   C1  
CONECT      C5     3 C6   N10  C4  
CONECT      N10    2 C5   C9  
CONECT      C9     3 C8   N10  C13 
CONECT      C13    3 C17  N12  C9  
CONECT      C1     3 C6   C2   H1  
CONECT      C2     3 C1   C3   H2  
CONECT      C3     3 C2   C4   H3  
CONECT      C4     3 C5   C3   H4  
CONECT      H191   1 C19 
CONECT      H192   1 C19 
CONECT      H17    1 C17 
CONECT      H24    1 O24 
CONECT      H251   1 C25 
CONECT      H252   1 C25 
CONECT      H311   1 C31 
CONECT      H312   1 C31 
CONECT      H313   1 C31 
CONECT      H111   1 C11 
CONECT      H112   1 C11 
CONECT      H7     1 C7  
CONECT      H1     1 C1  
CONECT      H2     1 C2  
CONECT      H3     1 C3  
CONECT      H4     1 C4  
END   
HET    EHD             42
HETSYN     EHD CAMPTOTHECIN
HETNAM     EHD 4-ETHYL-4-HYDROXY-1,12-DIHYDRO-4H-2-OXA-6,12A-DIAZA-DIB
HETNAM   2 EHD ENZO[B,H]FLUORENE-3,13-DIONE
FORMUL      EHD    C20 H16 N2 O4

This OCA MONOMER page
uses Jmol, developed by the Jmol Development Team (color reference)
OCA© by Jaime Prilusky, 1996-2004,2006,2010,2014
Bioinformatics Unit
Weizmann Institute of Science