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改写句英文句子麻烦哪位大侠改写句子The absence of NMR signals for MeN,MeO,and

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改写句英文句子
麻烦哪位大侠改写句子The absence of NMR signals for MeN,MeO,and aromatic ring moieties suggested that there was no oxazolidine ring in the skeleton and inferred that 2 was a C20 hetisine-type alkaloid
改成相同意思的不同说法,
改写句英文句子麻烦哪位大侠改写句子The absence of NMR signals for MeN,MeO,and
The absence of NMR signals for MeN, MeO, and aromatic ring moieties suggested that there was no oxazolidine ring in the skeleton and inferred that 2 was a C20 hetisine-type alkaloid
改成相同意思的不同说法就是:

There were not any NMR signals for MeN, MeO, and aromatic ring moieties. So there was no oxazolidine ring in the skeleton. The above implied that 2 was a C20 hetisine-type alkaloid.
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