HM2
ATOM  N1   N2   N3   N4   C1   C2   C3   C4   C5   C6 
ATOM  C7   C8   C9   C10  C11  C12  C13  C14  C15  C16
ATOM  C17  C18 CL1 
CONNECT -  N1   C1  C2  C3  C4  C5  N1 +
CONNECT  N2   C6  N3  C8  C9  C7  N2
CONNECT  N4   C7
CONNECT  N4   C10  C11  C12  C13  C14  C15  C16  C17  C12
CONNECT  C5   C6
CONNECT  C8   C18
CONNECT  C9  CL1