preferred_name: pyropheophorbide a + CO2 => C-13(2)-carboxypyropheophorbide a + H(+)
preferred_name_lc: pyropheophorbide a + co2 => c-13(2)-carboxypyropheophorbide a + h(+)
label: pyropheophorbide a + CO2 => C-13(2)-carboxypyropheophorbide a + H(+)
label_lc: pyropheophorbide a + co2 => c-13(2)-carboxypyropheophorbide a + h(+)