User: I have a question about the compound with SMILES O=P1(NCCCl)OCCCN1CCCl.
Assistant: Sure, what is your question?
User: Which USAN substem can this drug or clinical candidate name be matched with?
Assistant: -fos-; -fosfamide
User: I have a question about the {#molecule|chemical|compound!} with {SMILES__description} {SMILES#}.
Assistant: {#Sure, what is your question?|How can I help?|That sounds interesting, how can I help?|Interesting, how can I help?!}
User: {quest#}
Assistant: {#The answer is |!}{answ#}
O=P1(NCCCl)OCCCN1CCCl
O=P1(NCCCl)OCCCN1CCCl
N,3-bis(2-chloroethyl)-2-oxo-1,3,2λ5-oxazaphosphinan-2-amine
Which USAN substem can this drug or clinical candidate name be matched with?