A print liquid supply interface structure to fluidically connect a fluid supply container to a receiving station of a print system, the interface structure having a first, second and third dimensions that are perpendicular to each other, the interface structure comprising; a liquid channel having at least one liquid channel wall, the liquid channel including a liquid interface configured to fluidically connect to a fluidic needle of the receiving station, the interface including a seal to seal to the needle, and a needle receiving portion extending up to the liquid interface defining a needle insertion direction; at least one key pen (165, 265, 365, 665D, 665E, 665F, 665G, 965) extending parallel to the second interface dimension, next and parallel to the needle receiving portion of the liquid channel, the key pen protruding from a base over more than 10 millimeters; wherein the key pen and needle receiving liquid channel portion are provided in a first virtual reference plane parallel to the second and third interface dimensions; the interface structure further comprising a recess housing an integrated circuit, the integrated circuit located next to the needle receiving portion of the liquid channel and between the needle receiving portion and a key pen, wherein the integrated circuit is distanced from the first virtual reference plane, and wherein contact pad surfaces of the integrated circuit extend in a second virtual reference plane parallel to the second and third dimensions of the interface structure, the second virtual reference plane extending at a distance from a first virtual reference plane, the contact pad surfaces facing the first reference plane and extending along a line parallel to the third dimension of the interface structure; so that on connection with the receiving station, a data connector of the receiving station extends into the recess and between the liquid channel and the key pen and contacts surfaces of the contact pad array. the interface structure having a first, second and third dimensions that are perpendicular to each other, the interface structure comprising; a liquid channel having at least one liquid channel wall, the liquid channel including a liquid interface configured to fluidically connect to a fluidic needle of the receiving station, the interface including a seal to seal to the needle, and a needle receiving portion extending up to the liquid interface defining a needle insertion direction; a liquid interface configured to fluidically connect to a fluidic needle of the receiving station, the interface including a seal to seal to the needle, and a needle receiving portion extending up to the liquid interface defining a needle insertion direction; at least one key pen (165, 265, 365, 665D, 665E, 665F, 665G, 965) extending parallel to the second interface dimension, next and parallel to the needle receiving portion of the liquid channel, the key pen protruding from a base over more than 10 millimeters; wherein the key pen and needle receiving liquid channel portion are provided in a first virtual reference plane parallel to the second and third interface dimensions; the interface structure further comprising a recess housing an integrated circuit, the integrated circuit located next to the needle receiving portion of the liquid channel and between the needle receiving portion and a key pen, wherein the integrated circuit is distanced from the first virtual reference plane, and wherein contact pad surfaces of the integrated circuit extend in a second virtual reference plane parallel to the second and third dimensions of the interface structure, the second virtual reference plane extending at a distance from a first virtual reference plane, the contact pad surfaces facing the first reference plane and extending along a line parallel to the third dimension of the interface structure; so that on connection with the receiving station, a data connector of the receiving station extends into the recess and between the liquid channel and the key pen and contacts surfaces of the contact pad array.