preferred_name: pemetrexed(in) + H(+)(in) <=> pemetrexed(out) + H(+)(out)
preferred_name_lc: pemetrexed(in) + h(+)(in) <=> pemetrexed(out) + h(+)(out)
label: pemetrexed(in) + H(+)(in) <=> pemetrexed(out) + H(+)(out)
label_lc: pemetrexed(in) + h(+)(in) <=> pemetrexed(out) + h(+)(out)