STE
ATOM  C1   O1   O2   C2   C3   C4   C5   C6   C7   C8 
ATOM  C9   C10  C11  C12  C13  C14  C15  C16  C17  C18
CONNECT -  C1   O1 +
CONNECT  C1   O2
CONNECT  C1   C2  C3  C4  C5  C6  C7  C8  C9  C10  C11  C12
CONNECT  C12  C13  C14  C15  C16  C17  C18