Does anyone know the names for the artificial DNA?

Serendipity

A Traditional Eccentric!
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A (what is to this ancient one) long ago, there was an article about the identification of artificial DNA. The new ones were called P, Z, S and B. Our human ones are called G A C and T - short for guanine, adenosine, cytosine and thymidine (yes I know uracil replaces thymine at the RNA level). What do P, Z, S and B stand for?

Original article - Four new DNA letters double life’s alphabet

Many thanks in anticipation for your efforts.
 

Ori Vandewalle

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One of the papers referenced says:

Here, we present crystal structures of 16-mer duplexes showing this to be the case with two nonstandard nucleobases (Z, 6-amino-5-nitro-2(1H)-pyridone and P, 2-amino-imidazo[1,2-a]-1,3,5-triazin-4(8H)one)...

Not sure about the other two letters, though.
 

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