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Adenin
\purinev{4==NH$\mathrm{_2}$;6==H;2==H;1==H}
{\rm d}r(t) = a(b-r(t)){\rm d}t   \sigma {\rm d}W_t
{\rm d}x(t) = a(x, t){\rm d}t   b(x, t){\rm d}W_t
p_{[a-b-c]}=p_a\frac{p_b}{1-p_a}\frac{p_c}{1-p_a-p_b}+p_a\frac{p_c}{1-p_a}\frac{p_b}{1-p_a-p_c}
&&x = \sqrt{D}, \\
&&p_0 = 0, \\
&&q_0 = 1, \\
&&a_k =\lfloor \frac{x   p_k}{q_k} \rfloor, \;\; k \ge 0, \\
&&p_{k 1} = a_k Q_k - p_k, \;\; k \ge 0, \\
&&q_{k 1} = \frac{D  - p_{k   1}^2}{q_k}, \;\; k \ge 0.