L-histidyl-L-proline diketopiperazine(in) = L-histidyl-L-proline diketopiperazine(out)
l-histidyl-l-proline diketopiperazine(in) = l-histidyl-l-proline diketopiperazine(out)
L-histidyl-L-proline diketopiperazine(in) = L-histidyl-L-proline diketopiperazine(out)
l-histidyl-l-proline diketopiperazine(in) = l-histidyl-l-proline diketopiperazine(out)