label: 3-deacetyl-3-(1-hydroxyethyl)bacteriochlorophyllide a <=> 3-deacetyl-3-vinylbacteriochlorophyllide a + H2O
label_lc: 3-deacetyl-3-(1-hydroxyethyl)bacteriochlorophyllide a <=> 3-deacetyl-3-vinylbacteriochlorophyllide a + h2o