GVN
ATOM  N1   C2   C3   C4   C5   C6   C7  CL8   C9   C10
ATOM  C11  C12  C13  C14  C15  C16  C17  C18  N19  N20
ATOM  C21
CONNECT -  N1   C2  C3  C4  C5  C6  C7 CL8 +
CONNECT  C3   C11  C12  C13  C14  C15  C16  C11
CONNECT  C4   C10  C9  C7
CONNECT  C14  C17  C18  N19  N20  C21  C17