{% macro hs(items=[]) -%}
    {% for species in items -%}
    {% if loop.first == false %}+{% endif -%}
    {% if species.stoichiometry != 1 %}{{ species.stoichiometry }}*{% endif -%}
    {{ species.species }}
    {%- endfor %}
{% endmacro %}
{% for item in content %}
{% include "serialize/templates/layouts/linecomment.njk" %}
    {% if item.type === 'reaction' -%}
        {% if loop.first == false %}{{"\n"}}{% endif -%}
        {{ item.id }}: {{ hs(item.left) }}={{ hs(item.right) }};
    {%- endif -%}
{% endfor %}